Complex sentence: He won a special election on February 17,2015, for the state Senate to replace Leticia Van de Putte, who resigned to run, unsuccessfully as it developed, against the short-term incumbent, Ivy Taylor, for mayor of San Antonio, Texas.
Split into simpler sentences: He won a special election on February 17,2015, for the state Senate, to replace Leticia Van de Putte. She resigned to run, unsuccessfully as it developed, against the short-term incumbent, Ivy Taylor, for mayor of San Antonio, Texas.