Complex sentence: Though it did not do very well at the box office, the film is a minor cult classic among high school films; showing high school as most people remember it, with mundane days punctuated by occasional thrills.
Split into simpler sentences: Though it did not do very well at the box office, the film is a minor cult classic among high school films. It shows high school as most people remember it, with mundane days punctuated by occasional thrills.