Complex sentence: DiMarco also collaborates on biographies, having penned "Out of Bounds" with Roy Simmons, former offensive lineman for the New York Giants the first former NFL player to publicly announce that he is HIV positive.
Split into simpler sentences: DiMarco also collaborates on biographies, having penned "Out of Bounds" with Roy Simmons, former offensive lineman for the New York Giants. Simmons became the first former NFL player to publicly announce that he is HIV positive.