Complex sentence: There was a period of single party system between 1945 and 1989 during the communism, in which only the Communist Party was available for voting, while until 1945 there was no universal suffrage for the women.
Split into simpler sentences: There was a period of single party system between 1945 and 1989 during communism, during which only the Communist Party was allowed to stand. Until 1945 there was no universal suffrage for the women.