Complex sentence: He served as assistant conductor at the Berlin Philharmonic (1907-1912) and was the conductor of the Cincinnati Symphony Orchestra 1912-1917 and the Cincinnati May Festival 1914-1917.
Split into simpler sentences: He served as assistant conductor of the Berlin Philharmonic (1907-1912). He was the conductor of the Cincinnati Symphony Orchestra 1912-1917 and the Cincinnati May Festival 1914-1917.