Original: Ichthyosaurs, although common, are reduced in diversity; while the top marine predators, the pliosaurs, grew to the size of killer whales and larger (e.g. Pliosaurus, Liopleurodon).
Simplified: The top marine predators, the pliosaurs, grew to the size of killer whales and larger e.g. Pliosaurus, Liopleurodon.