Complex sentence: Many supporters went on to support the New Democratic Party, the Reform Party of Canada, and the Canadian Alliance while many former supporters in Quebec supported the Progressive Conservatives of Brian Mulroney and later the Bloc Quebecois.
Split into simpler sentences: Many supporters went on to support the New Democratic Party, the Reform Party of Canada, and the Canadian Alliance. While many supporters in Quebec supported the Progressive Conservatives of Brian Mulroney and later the Bloc Quebecois.