Complex sentence: Demoralized after two successive (and harsh) collectivization campaigns and the events of the 1956 Hungarian Revolution, the peasants were less interested in resisting, and as membership levels increased, those who remained likely grew worried about being left out.
Split into simpler sentences: Demoralized after two successive (and harsh) collectivization campaigns and the events of the 1956 Hungarian Revolution, the peasants were less interested in resisting. And as membership levels increased, those who remained likely grew worried about being left out.