Complex sentence: Le Roy Ladurie was a member of the French Communist Party (PCF) between 1945 and 1963; he left after doubts caused by the 1956 Hungarian Revolution became too much for him.
Split into simpler sentences: Le Roy Ladurie was a member of the French Communist Party (PCF) between 1945 and 1963. He left the party after doubts caused by the 1956 Hungarian Revolution became too much for him.