Complex sentence: The installation at Six Flags Discovery Kingdom is notable for using a single-car system, rather than trains as the other three Six Flags installations use--up to five cars operate at any one moment, with a sixth held in reserve.
Split into simpler sentences: The installation at Six Flags Discovery Kingdom is notable for using a single-car system, rather than trains as the other three Six Flags installations use. Up to five cars operate at any one moment, with a sixth held in reserve.