Complex sentence: In 1904 Dimanstein became a member of the Russian Social Democratic Labour Party in Vilno, where his major objective was to dispute with Jewish Socialist Party, Bund and Zionism parties.
Split into simpler sentences: In 1904 Dimanstein became a member of the Russian Social Democratic Labour Party in Vilno. In political debates, he often clashed with Jewish Socialist Party, Bund and Zionism parties.