John 4:41

καὶ πολλῷ πλείους ἐπίστευσαν διὰ τὸν λόγον αὐτοῦ,

Rough Word-by-word:
and many more they believed because of the word of him,

Smooth Translation:
and many more believed because of his word,

καὶ conjunction "and"

πολλῷ adjective dative singular masculine "many"

πλείους comparative adjective nominative plural masculine "more" ( note: can also be used as an adverb. Since it is a comparative with πολύς I would take it here to indicate more believers rather than adverbially indicating the degree of their belief being more.)

ἐπίστευσαν verb aorist active indicative 3rd plural from πιστεύω (I believe) "they believed"

διὰ preposition with accusative "because/ on account of"

τὸν definite article accusative singular masculine "the"

λόγον noun accusative singular masculine "word"

αὐτοῦ pronoun genitive singular masculine "of him"