Complex sentence: Following the February Revolution, the Mensheviks gained control of Russia and established a provisional government, but this lasted only a few months until the Bolsheviks took power in the October Revolution (also called the Bolshevik Revolution).
Split into simpler sentences: Following the February Revolution, the Mensheviks gained control of Russia and established a provisional government. Though this lasted only a few months until the Bolsheviks took power after the October Revolution (also called the Bolshevik Revolution).