Simplify the following text for a Grade 12 native English-speaking person.
Original: In the twentieth century , a movement for the canonization of FrÃ Savonarola began to develop within the Roman Catholic Church , particularly among Dominicans , with many judging his excommunication and execution to have been unjust .
Simplified: In the twentieth century , a movement for the canonization of `` FrÃ Savonarola '' began to develop within the Roman Catholic Church , particularly among Dominicans . Many believe that his excommunication and execution were not legal .