John 1:10

ἐν τῷ κόσμῳ ἦν, καὶ ὁ κόσμος δι' αὐτοῦ ἐγένετο, καὶ ὁ κόσμος αὐτὸν οὐκ ἔγνω.

ἐν preposition dative "in"

τῷ definite article dative masculine singular "the"

κόσμῳ noun dative masculine singular "world"

ἦν verb imperfect indicative 3rd singular from εἰμί "(he) was"

καὶ conjunction "and"

ὁ defininte article nominative masculine singular "the"

κόσμος noun nominative masculine singular "world"

δι' elided preposition with genitive "through"

αὐτοῦ personal pronoun genitive masculine singular "him"

ἐγένετο verb aorist middle indicative 3rd singular from γίνομαι "came to be"

καὶ correlating conjunction "but"

ὁ definite article nominative masculine singular "the"

κόσμος noun nominative masculine singular "world"

αὐτὸν personal pronoun accusative masculine singular "him"

οὐκ negative particle "not"

ἔγνω verb aorist active indicative 3rd singular from γινώσκω "he (or "it" - the world) knew"

Rough Translation:

in the world he was and the world through him came to be and the world him not it knew

Smooth Transaltion:

He was in the world and the world came to be through him, but the world did not know him.