The Mesosaurs were fast swimming predators which lived in fresh water, probably preying on small fish, insects and other aquatic invertebrates.
(The Mesosaurs; were; fast swimming predators which lived in fresh water,) (fast swimming predators; lived; L:in fresh water) Context(fast swimming predators lived,List([19, 54))):(fast swimming predators which lived in fresh water,; probably preying; on small fish, insects and other aquatic invertebrates)
fast swimming predators lived,List([19, 54))
The Mesosaurs fast swimming predators fast swimming predators which lived in fresh water,
were lived probably preying
fast swimming predators which lived in fresh water,
L:in fresh water
on small fish, insects and other aquatic invertebrates