Complex sentence: The athletic center was donated by Jon Corzine, former Governor of New Jersey and parent of a recent Pomfret graduate, and the Olmsted Student Union was donated by Robert Olmsted, an alumnus and long-time trustee of the school.
Split into simpler sentences: The athletic center was donated by Jon Corzine, former Governor of New Jersey and parent of a recent Pomfret graduate. The Olmsted Student Union was donated by Robert Olmsted, an alumnus and long-time trustee of the school.