Complex sentence: The Longo Planetarium (formally the Madeline D. and Joseph J. Longo Planetarium), is a 91-seat dome theater that features a Digistar 4 SP2 HD Digital Projector, which serves astronomy classes on campus and offers public showings for education and entertainment.
Split into simpler sentences: The Longo Planetarium (formally the Madeline D. and Joseph J. Longo Planetarium), is a 91-seat dome theater, and features a Digistar 4 SP2 HD Digital Projector. In addition to serving astronomy classes on campus, the Longo Planetarium offers public showings for education and entertainment.