Complex sentence: In reality, the Manifesto and the Constitution didn't result in a significant increase in freedom or government representation for the Russian people, as the Tsar continued to exercise veto power over the Duma, and he dissolved and reformed it several times.
Split into simpler sentences: In reality, the Manifesto (and the Constitution) did not result in a significant increase in freedom or government representation for the average Russian. The Tsar continued to exercise veto power over the Duma, and he dissolved and reformed it several times.