Complex sentence: It primarily eats zooplankton, insects, insect larvae, and phytoplankton, although it can eat a variety of other foods, such as worms and small crustaceans, if its preferred sources are not readily available.
Split into simpler sentences: It primarily eats zooplankton, insects, insect larvae, and phytoplankton. It can eat a variety of other foods, such as worms and small crustaceans, if its preferred sources are not readily available.