Complex sentence: After the defeat of the second Meighen government, Tolmie moved to provincial politics and became leader of the British Columbia Conservative Party leaving the House of Commons in 1928 to fight the provincial election.
Split into simpler sentences: After the defeat of the second Meighen government, Tolmie moved to provincial politics and became leader of the British Columbia Conservative Party. He left the House of Commons in 1928 to fight the 1928 provincial election.