Complex sentence: Stephen P. Heymann is one of about one hundred Assistant U.S. Attorneys working in the Office of United States Attorney for the District of Massachusetts Carmen Ortiz, and chief of the Office's cyber crimes unit.
Split into simpler sentences: Stephen P. Heymann is one of about one hundred Assistant U.S. Attorneys working in the Office of United States Attorney for the District of Massachusetts, Carmen Ortiz. He is chief of the Office's cyber crimes unit.