YOU SAID:
because his shield is the size of a dinner plate
INTO JAPANESE
彼の盾はディナープレートの大きさだから
BACK INTO ENGLISH
His shield is the size of a dinner plate.
INTO JAPANESE
彼の盾はディナープレートの大きさです。
BACK INTO ENGLISH
His shield is the size of a dinner plate.
That didn't even make that much sense in English.