YOU SAID:

the cat found everyone eating mangos

INTO JAPANESE

猫はみんながマンゴーを食べているのを見つけた

BACK INTO ENGLISH

The cats found that everyone was eating mango

INTO JAPANESE

猫はみんながマンゴーを食べていたことがわかりました

BACK INTO ENGLISH

The cat understood that everyone was eating mango

INTO JAPANESE

猫は誰もがマンゴーを食べていたことを理解しました

BACK INTO ENGLISH

The cat understood that everyone was eating mango