YOU SAID:
That guy is eating a sandwich made by sand and bread
INTO JAPANESE
あの男は砂とパンで作ったサンドイッチを食べている
BACK INTO ENGLISH
That man is eating a sandwich made of sand and bread
INTO JAPANESE
あの男は砂とパンで作ったサンドイッチを食べている
BACK INTO ENGLISH
That man is eating a sandwich made of sand and bread
That didn't even make that much sense in English.