Complex sentence: Svetislav Stančić (7 July 1895 in Zagreb--7 January 1970 in Zagreb) was a Croatian concert pianist who became a piano teacher at the Music Academy in Zagreb.
Split into simpler sentences: Svetislav Stančić (7 July 1895 in Zagreb--7 January 1970 in Zagreb) was a Croatian pianist and music pedagogue. Stančić had a career as a concert pianist, and later he became a piano teacher at the Music Academy in Zagreb.