Complex sentence: Alioto served on the San Francisco Board of Supervisors from 1988 to 1997 and ran unsuccessfully for Mayor of San Francisco in 1991,1995 and 2003.
Split into simpler sentences: Alioto served on the San Francisco Board of Supervisors from 1988 to 1997. Alioto unsuccessfully ran for Mayor of San Francisco in 1991,1995 and 2003.