Complex sentence: Choi ran for re-election in 2009, but was defeated in the primary election by Antonia "Toni" Ricigliano, who went on to win the general election, and took office January 1,2010.
Split into simpler sentences: Choi ran for re-election in 2009, but was defeated in the primary election by Antonia "Toni" Ricigliano. Ricigliano went on to win the general election, and took office January 1,2010.