Simplify the following text for a Grade 8 native English-speaking person.
Original: One rationale was that a serf `` worked for all , '' while a knight or baron `` fought for all '' and a churchman `` prayed for all '' ; thus everyone had a place .
Simplified: During that time , people said that the a serf `` worked for all '' , a knight or baron `` fought for all '' and a churchman `` prayed for all . ''