Simplify the following text for a Grade 13 native English-speaking person.
Original: The Western Schism , or Papal Schism , was a prolonged period of crisis in Latin Christendom from 1378 to 1416 , when there were two or more claimants to the See of Rome and there was conflict concerning the rightful holder of the papacy .
Simplified: The Western Schism , or Papal Schism , was a prolonged period of crisis in Latin Christendom from 1378 to 1416 , when there were two or more claimants to the See of Rome and thus it was difficult to discern who the true Pope was .