Complex sentence: Track rides are usually rides in the form of a train on a track; in most coin-operated train-type track rides, the coin mechanism is on the locomotive unit of the ride and it can seat two to three toddlers.
Split into simpler sentences: Track rides are usually rides in the form of a train on a track. In most coin-operated train-type track rides, the coin mechanism on is on the locomotive unit of the ride and the ride can sit two to three toddlers.