Complex sentence: In March 2010, Villere announced that he would run for lieutenant governor, a position vacated on May 3 by Democrat Mitch Landrieu, who was elected as the mayor of New Orleans.
Split into simpler sentences: In March 2010, Villere announced that he would seek the position of lieutenant governor, which was vacated on May 3 by Democrat Mitch Landrieu. He was elected as the mayor of New Orleans.