Complex sentence: For the film's screening, Paramount and William Friedkin prepared specific instructions regarding music: they demanded a three-and-half-minute musical overture to be played prior to each screening, and prohibited any alterations to it.
Split into simpler sentences: For the film's screening, Paramount and William Friedkin prepared specific instructions regarding music. They demanded a three-and-half-minute musical overture to be played prior to each screening, and prohibited any alterations to it.