Complex sentence: The Conservatives won only 40 seats, in part, due to the party splitting after Trade Minister Henry Herbert Stevens left the Conservatives to form the Reconstruction Party of Canada which received almost 400,000 votes in the election leading to the defeat of numerous Conservative MPs.
Split into simpler sentences: The Conservatives won only 40 seats, in part, because the party split after Trade Minister Henry Herbert Stevens left the Conservatives to form the Reconstruction Party of Canada. Stevens' party received almost 400,000 votes in the election leading to the defeat of numerous Conservative MPs.