YOU SAID:

I know a potato who knows a tomato and is really a cat

INTO JAPANESE

私はトマトを知っていて、本当に猫であるジャガイモを知っています

BACK INTO ENGLISH

I know tomatoes and really know potatoes that are cats

INTO JAPANESE

私はトマトを知っており、猫であるジャガイモを本当に知っています

BACK INTO ENGLISH

I know tomatoes and really know potatoes that are cats