YOU SAID:

with everybody here I find it hard to say that it was him who had done it, seeing as it could've been anyone who was here during that time

INTO JAPANESE

ここにいるみんなと一緒にやったのは彼だと言うのは難しいと思う。

BACK INTO ENGLISH

I don't think it's hard to say that he did with everyone here.

INTO JAPANESE

彼がここのみんなとやったと言うのは難しいとは思いません。

BACK INTO ENGLISH

I don't think it's difficult to say he did with everyone here.

INTO JAPANESE

彼がここのみんなとやったと言うのは難しいとは思いません。

BACK INTO ENGLISH

I don't think it's difficult to say he did with everyone here.