Complex sentence: Cornelius Cruys became the first "Russian" mayor of Taganrog 1698-1702 and in 1711, and he made the first maps of Azov Sea and Don River.
Split into simpler sentences: Cornelius Cruys became the first "Russian" mayor of Taganrog 1698-1702. In 1711 he made the first maps of Azov Sea and Don River.