Complex sentence: The University of New Hampshire's athletic program consist of 18 NCAA programs and they play at the Durham campus of UNH, the City of Manchester does on occasion host home games of the UNH men's ice hockey team.
Split into simpler sentences: The University of New Hampshire's athletic program consists of 18 NCAA programs, all of which play at the Durham campus of the University. However, the City of Manchester does on occasion host home games of the UNH men's ice hockey team.