Complex sentence: Ross supported the Bolshevik Revolution in Russia, even as he acknowledged its bloody origins, and was a member of the Dewey Commission which cleared Trotsky of all charges made during the Moscow Trials.
Split into simpler sentences: Ross supported the Bolshevik Revolution in Russia, even as he acknowledged its bloody origins. Ross was a member of the Dewey Commission which cleared Trotsky of all charges made during the Moscow Trials.