Complex sentence: Prior to her election to the Council, Rosie Mendez was the Democratic District Leader for her community for four terms, and for three years served as the Chief of Staff and Legislative Aide to her predecessor City Councilwoman Margarita Lopez.
Split into simpler sentences: Prior to her election to the Council, Rosie Mendez was the Democratic District Leader for her community for four terms. She served for three years as the Chief of Staff and Legislative Aide to her predecessor City Councilwoman Margarita Lopez.