Complex sentence: At age 21, Mamet entered politics by working on the 1992 U.S. Senate primary bid by onetime U.S. Rep. Mel Levine; he also worked for the California Democratic Party helping with Bill Clinton's 1992 presidential campaign in Santa Barbara County.
Split into simpler sentences: At age 21, Mamet entered politics by working on the 1992 U.S. Senate primary bid by onetime U.S. Rep. Mel Levine. He also worked for the California Democratic Party helping with Bill Clinton's 1992 presidential campaign in Santa Barbara County.