Complex sentence: Like the rest of the mackerel sharks, the pelagic thresher is ovoviviparous-it gives birth to two pups at a time (rarely just one), one per uterus.
Split into simpler sentences: Like the rest of the mackerel sharks, the pelagic thresher is ovoviviparous. It gives birth to two pups at a time (rarely just one), one per uterus.