YOU SAID:
A potato is not an animal, nor is a cat a vegetable.
INTO JAPANESE
ジャガイモも、動物ではない猫は、野菜。
BACK INTO ENGLISH
Cat potato is not an animal is a vegetable.
INTO JAPANESE
猫のジャガイモは、動物は野菜ではありません。
BACK INTO ENGLISH
Potato cat animal is not a vegetable.
INTO JAPANESE
ジャガイモ猫動物は野菜ではありません。
BACK INTO ENGLISH
Potato cat animal is not a vegetable.
That didn't even make that much sense in English.