Complex sentence: He subsequently crossed the floor to rejoin the Conservative Party in 1938 and ran as a candidate in the 1940 Conservative leadership convention but was eliminated on the first ballot, losing to Arthur Meighen.
Split into simpler sentences: He subsequently crossed the floor to rejoin the Conservative Party in 1938, and ran as a candidate in the 1940 Conservative leadership convention. He was eliminated on the first ballot, losing to Arthur Meighen.