Complex sentence: She married Arsen Karađorđević, Prince of Serbia in Saint Petersburg on 1 May 1892, and they had a son Prince Paul of Yugoslavia who later became the Regent of Yugoslavia.
Split into simpler sentences: She married Arsen Karađorđević, Prince of Serbia, in Saint Petersburg on 1 May 1892. They had a son, Prince Paul of Yugoslavia, who later became the Regent of Yugoslavia.