Complex sentence: Jewish self-defense leagues, organized after the first pogrom, stopped some of the violence, but were not wholly succ was a part of a much larger movement of 600 pogroms that swept the Russian Empire after the October Manifesto of 1905.
Split into simpler sentences: Jewish self-defense leagues, organized after the first pogrom, stopped some of the violence, but were not wholly successful. This Pogrom was part of a much larger movement of 600 pogroms that swept the Russian Empire after the October Manifesto of 1905.