YOU SAID:

they were kids that i once knew

INTO JAPANESE

彼らは私がかつて知っていた子供たちだった

BACK INTO ENGLISH

They were children I used to know

INTO JAPANESE

彼らは私が知っていた子供たちでした

BACK INTO ENGLISH

They were the children I knew

INTO JAPANESE

彼らは私が知っていた子供たちでした

BACK INTO ENGLISH

They were the children I knew