YOU SAID:

i think that the more complex the sentence is, the longer it takes

INTO JAPANESE

文章が複雑であればあるほど時間がかかると思います

BACK INTO ENGLISH

I think the more complicated the sentence, the more time it takes.

INTO JAPANESE

文章が複雑になればなるほど時間がかかると思います。

BACK INTO ENGLISH

I think the more complicated the sentence, the longer it will take.

INTO JAPANESE

文章が複雑になればなるほど、時間がかかると思います。

BACK INTO ENGLISH

I think the more complicated the sentence, the longer it will take.