Complex sentence: Oakton Community College opened in 1969 in former industrial buildings at Oakton and Nagle in Morton Grove, which was closed when the Des Plaines and Skokie campuses opened.
Split into simpler sentences: Oakton Community College opened in 1969 in former industrial buildings at Oakton and Nagle in Morton Grove. This original campus closed when the Des Plaines and Skokie campuses opened.