YOU SAID:

this was no easy task, as they were already considering marriage

INTO JAPANESE

彼らはすでに結婚を考えていたので、これは容易な仕事ではありませんでした

BACK INTO ENGLISH

This was not an easy task as they were already thinking about getting married

INTO JAPANESE

彼らはすでに結婚を考えていたので、これは簡単な作業ではありませんでした

BACK INTO ENGLISH

This was not an easy task as they were already thinking about getting married