Complex sentence: The first cue appears twelve feet (3.7 m) before the end of the program on the reel, equivalent to eight seconds at 24 frame/s. This cue signals the projectionist to start the motor of the projector containing the next reel.
Split into simpler sentences: The first cue appears twelve feet (3.7 m) before the end of the program on the reel. That's eight seconds at 24 frame/s. This cue signals the projectionist to start the motor of the projector containing the next reel.