YOU SAID:
It is largely dependant on his surroundings.
INTO JAPANESE
それは彼の環境に大きく依存しています。
BACK INTO ENGLISH
It depends on his environment.
INTO JAPANESE
こいつ次第だ
BACK INTO ENGLISH
It depends on this guy.
INTO JAPANESE
こいつ次第だ
BACK INTO ENGLISH
It depends on this guy.
That didn't even make that much sense in English.