Complex sentence: O'Keefe was born in and reared in Delmar, New York, where he attended Bethlehem Central High School (1997-2001), before studying political science at American University (2001-2005) in their School of Public Affairs.
Split into simpler sentences: O'Keefe was born in and reared in Delmar, New York, where he attended Bethlehem Central High School (1997-2001). He studied political science at American University (2001-2005) in their School of Public Affairs.