Complex sentence: Unlike other mayors in council-manager systems, the Columbia mayor has the power to veto ordinances passed by the council; vetoes can be overridden by a two-thirds majority of the council, which appoints a city manager to serve as chief administrative officer.
Split into simpler sentences: Unlike other mayors in council-manager systems, the Columbia mayor has the power to veto ordinances passed by the council; vetoes can be overridden by a two-thirds majority of the council. The council appoints a city manager to serve as chief administrative officer.