I -- The subject pronoun repeats the information in the verb so it should be repeated in English like "I myself."  When it has no verb, the verb "is" or the previous verb is assumed.

in   -- The word translated as "in" means "in," "within," "with" (an instrument), "by" (near), "by" (means of), "during" (time),  or "among"  with a dative object as the one here.  With the accusative, it means "into," "on," and "for." When referring to time, it means "during." It can mean "on," "at," or "by" in the sense of "near."

them, -- The word translated as "them" or "to them" is the Greek adjective that acts like our third-person pronoun. The form is the third person, plural as an indirect object of the verb or the object of a preposition. A dative object of a preposition implies no movement but in a fixed position.

and -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also"). In a series, it can be translated as "not only...but also." After words implying sameness "as."

thou -- The  "you" here in the second-person pronoun in form of a singular subject. When it has no verb, the verb "is" or the previous verb is assumed.

in -- The word translated as "in" means "in," "within," "with" (an instrument), "by" (near), "by" (means of), "during" (time),  or "among"  with a dative object as the one here.  With the accusative, it means "into," "on," and "for." When referring to time, it means "during." It can mean "on," "at," or "by" in the sense of "near."

me, -- The "me" is in the indirect object form of the first-person pronoun, so usually "to me,""for me," and "by me." A dative object of a preposition implies no movement, but in a fixed position, events that occur at a specified time or while the action was being performed.

that -- The word translated as "that" is a conjunction that starts a subordinate clause  "that," "when," "in order that" "when," or "because." It is used as an introduction to a command, where it isn't translated. -- The word translated as "there" is an adverb "in that place," "there," "where," or "when."

they -- This is from the third-person, plural form of the verb.

may -- This helping verb "may" indicates that the verb indicates a possibility, the subjunctive. Helping or auxiliary verbs are needed to translate the Greek verb forms into English.

be -- (CW) The verb "be" here is the common form of "to be" in Greek. It means to have a certain characteristic or remain in a certain condition. It also equates terms or assigns characteristics.  The word also means "to exist" and where it doesn't connect to characteristics or conditions. It is confusing here because it is made to appear as a helping verb, creating a passive, which it is not.

made perfect  - - (WT, CV) This is from a verb that means "make perfect", "to make complete", "make perfect", "to bring to consummation," and "to bring fruit to maturity." This is a participle and it is the past perfect, so "have made perfect" but its voice is either the passive (separate from the verb above) or the middle voice, something the apostles do to themselves.

in-- (CW) The word translated as "in" means "into" a place, "towards" as a direction, "as much as (of measure or limit)," "in regards to" a subject,"up to" limits in time and measure, and "for" a purpose or object. It is notthe "in" earlier in this verse and in the other verses about being "in" each other,

one; -- The Greek word translated as "one " means "one" (as opposed to other numbers), "single," and "one and the same."As in English, it can be used as a pronoun, meaning a single person.

and -- (OS) There is nothing in the Greek that can be translated as "and" in the source we use today but it does exist in the source that the KJV translators used.

that -- The word translated as "that" is a conjunction that starts a subordinate clause  "that," "when," "in order that" "when," or "because." It is used as an introduction to a command, where it isn't translated.

the -- The word translated as "the" is the Greek definite article; without a noun, it has the sense of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

world . -- Jesus uses the word translated as "the world" to mean "the world order," and "civilization," specifically its "rulers," or its organization. Today, we use the word "society" or "regime" in this sense. More about this word in this article about related words.

may -- This helping verb "may" indicates that the verb indicates a possibility, the subjunctive. Helping or auxiliary verbs are needed to translate the Greek verb forms into English.

know -- "Know" is a verb that means "to know," "to recognize," "make known," "to know carnally," and "to learn." The idea of "realize" seems to capture most senses of this word better than "know," which is the meaning of "have seen."

that -- (CW) The word translated as "that" introduces a statement of fact or cause, "for what," "because," "since," and "wherefore." It is not the "that" above.

thou -- The  "you" here in the second-person pronoun in form of a singular subject. Since, as the subject of the sentence, it is part of the verb, its explicit use repeats the idea of who is speaking, "you." Saying "you yourself" captures this feeling in English.

missing "yourself" -- (MW)  The subjective pronoun repeats the information in the verb so it should be repeated in English like "you yourself."

hast -- (WT) This helping verb "has" indicates that the verb is the tense indicating an action completed in the past. This is not the tense of the verb here.

sent   --- (CW) The "send " here is a word that means "to send off" and "dispatch." It is the source of our word "apostle." This word is not the simple "send" but a more complex one that means "send out" or "send from." CW --Confusing Word -- The "sent" does not capture the word's specific meaning.

me, -- "Me" is the regular first-person pronoun in Greek as the object of the verb or preposition. As the object of a preposition, an accusative object indicates movement towards something or a position reached as a result of that movement.

and -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also"). In a series, it can be translated as "not only...but also." After words implying sameness "as."

hast -- (WT) This helping verb "has" indicates that the verb is the tense indicating an action completed in the past. This is not the tense of the verb here.

loved -- (CW) The word translated as "love" expresses a lot of different ideas including "to be fond of," "to greet with affection," "to persuade," and "to be contented with." Jesus however, applies it to relationships where we have a duty to care for others: family, God, etc. Another word, also translated as "love," is used to for relationships of affectionate friendship that are more voluntary. To distinguish this word, translating it as "cares for" seems to work best. See this article on love for more information.

them, -- The word translated as "them" is the Greek word commonly translated as third-person pronouns in English in the form of a plural object of a verb or preposition.

as  -- "As" is from a Greek word that means which means "even as," "how," and, in relating to time, "as" and "when."

thou -- This is from the second-person, singular form of the verb.

hast -- (WT) This helping verb "has" indicates that the verb is the tense indicating an action completed in the past. This is not the tense of the verb here.

loved -- (CW) The word translated as "love" expresses a lot of different ideas including "to be fond of," "to greet with affection," "to persuade," and "to be contented with." Jesus however, applies it to relationships where we have a duty to care for others: family, God, etc. Another word, also translated as "love," is used to for relationships of affectionate friendship that are more voluntary. To distinguish this word, translating it as "cares for" seems to work best. See this article on love for more information.

me, -- "Me" is the regular first-person pronoun in Greek as the object of the verb or preposition. As the object of a preposition, an accusative object indicates movement towards something or a position reached as a result of that movement.