Complex sentence: Also, creation of these regions served one of purposes of the bolsheviks-to export the revolution, since after their defeat in the Polish-Soviet War, the Soviets did not give up their idea of creating a Soviet Republic in Poland.
Split into simpler sentences: Also, creation of these regions served one of purposes of the bolsheviks-to export the revolution. After their defeat in the Polish-Soviet War, the Soviets did not give up their idea of creating a Soviet Republic in Poland.