Complex sentence: This marked the start of over 39 consecutive years in power for the Liberals; the Conservatives never held power again in Quebec and ceased to exist in 1936 when they merged with the Action libérale nationale to form the Union Nationale.
Split into simpler sentences: This marked the start of over 39 consecutive years in power for the Liberals. The Conservative Party never held power again in Quebec and ceased to exist in 1936 when it merged with the Action libérale nationale to form the Union Nationale.