Simplify the following text for a Grade 12 native English-speaking person.
Original: There is a legend that it was Boniface VIII 's doing that Celestine V renounced the papacy - for Boniface , previously Benedetto , convinced Celestine V that no person on the earth could go through life without sin .
Simplified: There is a legend that it was Benedetto Gaetani 's doing that Celestine V renounced the papacyâ '' convincing Celestine V that no person on the earth could go through life without sin .