Complex sentence: Wide release is a term in the American motion picture industry for a motion picture that is playing nationally (as opposed to a few cinemas in cities such as New York and Los Angeles) and on 600 screens or more in the United States and Canada.
Split into simpler sentences: Wide release is a term in the American motion picture industry for a motion picture that is playing nationally (as opposed to a few cinemas in cities such as New York and Los Angeles). Specifically, a movie is considered to be in wide release when it is on 600 screens or more in the United States and Canada.