YOU SAID:

I must say something incredibly difficult to translate to and fro

INTO JAPANESE

私は前後に翻訳するのが信じられないほど難しいことを言わなければなりません

BACK INTO ENGLISH

I have to say that it's incredibly difficult to translate back and forth

INTO JAPANESE

前後に翻訳するのは信じられないほど難しいと言わざるを得ません

BACK INTO ENGLISH

I have to say that translating back and forth is incredibly difficult

INTO JAPANESE

前後の翻訳は非常に難しいと言わざるを得ません

BACK INTO ENGLISH

I have to say that translation before and after is very difficult.

INTO JAPANESE

前後の翻訳はとても難しいと言わざるを得ません。

BACK INTO ENGLISH

I have to say that translation before and after is very difficult.