YOU SAID:

I have eaten a yellow potato while eating a green potato

INTO JAPANESE

グリーンポテトを食べながらイエローポテトを食べました

BACK INTO ENGLISH

I ate yellow potatoes while eating green potatoes

INTO JAPANESE

グリーンポテトを食べながらイエローポテトを食べました

BACK INTO ENGLISH

I ate yellow potatoes while eating green potatoes