Complex sentence: Another prominent Tiflis Bolshevik, Stepan Shahumyan, moved to Baku, leaving their social-democratic rivals, Georgian Mensheviks, without any significant opposition.
Split into simpler sentences: Another prominent Tiflis Bolshevik, Stepan Shahumyan, moved to Baku. This left their social-democratic rivals, Georgian Mensheviks, without any significant opposition.