Simplify the following text for a Grade 15 native English-speaking person.
Original: Some writers and anthropologists argue that missionaries , in seeking to â civilise and institutionaliseâ Aboriginal people , forced them to abandon their lifestyle , language , religion and ceremoniesâ '' indeed , the whole fabric of their lives .
Simplified: Some writers and anthropologists say that missionaries , in trying to â civilise and institutionaliseâ Aboriginal people , forced them to give up their lifestyle , language , religion , ceremonies and change the whole way they lived .