Complex sentence: The Liberal Party of Canada leadership convention of 1968 elected Pierre Elliott Trudeau as the new leader of the Liberal Party; he was the unexpected winner in what was one of the most important leadership conventions in party history.
Split into simpler sentences: The Liberal Party of Canada leadership convention of 1968 elected Pierre Elliott Trudeau as the new leader of the Liberal Party. He was the unexpected winner in what was one of the most important leadership conventions in party history.