Complex sentence: He mounted a bid in the Democratic primary for California Governor in 1994 on the theme of campaign finance reform, and ran for Mayor of Los Angeles in 1997, losing to incumbent Republican Richard Riordan.
Split into simpler sentences: He mounted a bid in the Democratic primary for California Governor in 1994 on the theme of campaign finance reform. He ran for Mayor of Los Angeles in 1997 but lost to incumbent Republican Richard Riordan.