Complex sentence: Eliasberg graduated from the Leningrad Conservatory as a violinist in 1929, and was conductor of the Leningrad Theatre of Musical Comedy from 1929 to 1931 before joining Leningrad Radio as conductor.
Split into simpler sentences: Eliasberg graduated from the Leningrad Conservatory as a violinist in 1929. And was conductor of the Leningrad Theatre of Musical Comedy from 1929 to 1931 before joining Leningrad Radio as conductor.