Complex sentence: David Chiu (born April 2,1970) is the President of the San Francisco Board of Supervisors and supervisor for District 3, which encompassing the northeastern corner of the city, including Chinatown, North Beach, the Financial District, and Fisherman's Wharf.
Split into simpler sentences: David Chiu (born April 2,1970) is the President of the San Francisco Board of Supervisors. He represents District 3, encompassing the northeastern corner of the city, including Chinatown, North Beach, the Financial District, and Fisherman's Wharf.