YOU SAID:

oh he was a person that did this and this and this at war

INTO JAPANESE

ああ、彼はこれとこれと戦争でこれをした人でした

BACK INTO ENGLISH

Oh, he was the one who did this in this and this and the war

INTO JAPANESE

ああ、彼はこれとこれと戦争でこれをした人でした

BACK INTO ENGLISH

Oh, he was the one who did this in this and this and the war