YOU SAID:

A human brain can only hold so many cat facts

INTO JAPANESE

人間の脳は猫に関する事実をそれほど多くは記憶できない

BACK INTO ENGLISH

The human brain can't remember many facts about cats

INTO JAPANESE

人間の脳は猫に関する多くの事実を記憶できない

BACK INTO ENGLISH

The human brain can't remember many facts about cats