Complex sentence: The resulting shortage of food sources in the tropics during Plio-Pleistocene times may have fueled cannibalism by megalodon, and juveniles were at increased risk from attacks by adults during times of starvation.
Split into simpler sentences: The resulting shortage of food sources in the tropics during Plio-Pleistocene times may have fueled cannibalism by megalodon. Juveniles were at increased risk from attacks by adults during times of starvation.