Complex sentence: Liberalism was defeated in Russia when the Communists came to power under Vladimir Lenin in 1917, in Italy when Mussolini set up his dictatorship in 1922, in Poland in 1926 under Józef Piłsudski, and in Spain in 1939 after the Spanish Civil War.
Split into simpler sentences: Liberalism was defeated in Russia when the Communists came to power under Vladimir Lenin in 1917, and in Italy when Mussolini set up his dictatorship in 1922. Liberalism also lost out in Poland in 1926 under Józef Piłsudski and in 1939 after the Spanish Civil War.