Complex sentence: On May 26,1931, he became the Secretary General of the newly created Russian Fascist Party; in 1934 the Party amalgamated with the Russian Fascist Organization, Rodzaevsky becoming its leader.
Split into simpler sentences: On May 26th, 1931 he became the Secretary General of the newly created Russian Fascist Party. In 1934 the Party amalgamated with the Russian Fascist Organization, Rodzaevsky becoming its leader.