Complex sentence: Díaz became the Bronx Borough President in April 2009 after serving as a New York State Assemblyman representing the 85th Assembly District, which extended through Bronx River, Clason Point, Harding Park, Hunts Point, Soundview, and Southern Boulevard.
Split into simpler sentences: Díaz became the Bronx Borough President in April 2009 after representing the 85th Assembly District in the New York State Assembly. Diaz's Assembly district extended through Bronx River, Clason Point, Harding Park, Hunts Point, Soundview, and Southern Boulevard.