Complex sentence: The government of Czechoslovakia under communism was in theory a democratic one directed by the proletariat, its critics however state that in practice it was much closer to being totalitarian dictatorship run by the Communist Party of Czechoslovakia, the KSC.
Split into simpler sentences: The government of Czechoslovakia under communism was in theory a democratic one directed by the proletariat. In practice, it was a one-party dictatorship run by the Communist Party of Czechoslovakia, the KSC.