Complex sentence: It never elected a candidate at any level and collapsed by 1929 with Communists being expelled from the Quebec, Alberta and British Columbia sections of the party and non-Communists withdrawing from the Ontario section and refusing to participate in the Manitoba section.
Split into simpler sentences: It never elected a candidate at any level, and collapsed by 1929. The Communists were expelled from the Quebec, Alberta and British Columbia sections of the party, and non-Communists withdrew from the Ontario section and refused to participate in the Manitoba section.