Complex sentence: James Brown Winston (1820--1884) was the first medical officer of the city of Los Angeles, California, in the 19th century and a member of both the Los Angeles Common Council, the city's governing body, and the county Board of Supervisors.
Split into simpler sentences: James Brown Winston (1820--1884) was the first medical officer of the City of Los Angeles, California, in the 19th century. He also was a member of both the Los Angeles Common Council, the city's governing body, and the Los Angeles County Board of Supervisors.