YOU SAID:
a potato was walking while eating a burger
INTO JAPANESE
ジャガイモがハンバーガーを食べながら歩いていた
BACK INTO ENGLISH
Potatoes were walking while eating burgers
INTO JAPANESE
ジャガイモはハンバーガーを食べながら歩いていた
BACK INTO ENGLISH
Potatoes were walking while eating burgers
That didn't even make that much sense in English.