Complex sentence: Boris Yakovlevich Bukov, also Boris Bykov ("Sasha") Regiment Comissar (15 November 1935) was a member of the Communist Party member since 1919.
Split into simpler sentences: Boris Yakovlevich Bukov, also Boris Bykov ("Sasha") Regiment Comissar (15 November 1935). Was a member of the Communist Party member since 1919.