Complex sentence: The Ontario Progressive Conservative Party, led by George Drew, defeated the Ontario Liberal Party government which had disintegrated over the previous two years due to the conflict between Mitchell Hepburn, the Ontario caucus and the federal Liberal Party of Canada.
Split into simpler sentences: The Ontario Progressive Conservative Party, led by George Drew, defeated the Ontario Liberal Party government. The Liberal government had disintegrated over the previous two years because of a conflict between Mitchell Hepburn, the Ontario caucus and the federal Liberal Party of Canada.