YOU SAID:

that which it is would not be under any cicumstances considered to have been difficult

INTO JAPANESE

困難であったと考えられるものでないこと。

BACK INTO ENGLISH

It is not considered to have been difficult.

INTO JAPANESE

難しかったとは考えられない。

BACK INTO ENGLISH

I don't think it was difficult.

INTO JAPANESE

難しくなかったと思います。

BACK INTO ENGLISH

I don't think it was difficult.