YOU SAID:

Much has happened in my absence

INTO JAPANESE

私の不在の間に多くのことが起こった

BACK INTO ENGLISH

Many things happened during my absence

INTO JAPANESE

留守の間に色々なことがありました

BACK INTO ENGLISH

There were many things while I was away

INTO JAPANESE

離れている間に色々あった

BACK INTO ENGLISH

There were various things while I was away

INTO JAPANESE

留守中は色々ありました

BACK INTO ENGLISH

There were various things while I was away