YOU SAID:

For centuries, the forgotten forgot what they once knew because they were a forgetful people.

INTO JAPANESE

何世紀にもわたって、忘れっぽい人々だったので、忘れられた人々はかつて知っていたことを忘れていました。

BACK INTO ENGLISH

For centuries, people have been forgotten, so forgotten people have forgotten what they once knew.

INTO JAPANESE

何世紀にもわたって、人々は忘れられてきたので、忘れられた人々は彼らがかつて知っていたことを忘れてきました。

BACK INTO ENGLISH

For centuries, people have been forgotten, so forgotten people have forgotten what they once knew.