Complex sentence: He was elected to the Canadian House of Commons in the 1911 Canadian election due to an informal alliance between the Conservatives and the Nationalists led by Henri Bourassa and due to Sevigny's sympathy with Bourassa's views.
Split into simpler sentences: He was elected to the Canadian House of Commons in the 1911 federal election. His election was faciliatated by an informal alliance between the Conservatives and the Nationalists led by Henri Bourassa because of Sevigny's sympathy with Bourassa's views.