Complex sentence: Cornelius Jaenen argues that, "The Conquest has remained a difficult subject for French-Canadian historians" were divided between those who see it as a highly negative economic, political and ideological disaster that threatened a way of life with materialism and Protestantism.
Split into simpler sentences: Cornelius Jaenen argues that, "The Conquest has remained a difficult subject for French-Canadian historians" who were divided in viewing it. One group sees it as a highly negative economic, political and ideological disaster that threatened a way of life with materialism and Protestantism.