Complex sentence: Spotted eagle ray preys mainly upon bivalves, shrimps, crabs, whelks, benthic infauna they feed on mollusks and crustaceans, particularly malacostracans.
Split into simpler sentences: Spotted eagle ray preys mainly upon bivalves, shrimps, crabs, whelks, and other benthic infauna. They feed on mollusks and crustaceans, particularly malacostracans.