Complex sentence: Many coastal shallows were created, and that caused Icthyosaurs to die out, but some island-hopping dinosaurs, like Eustreptospondylus to cope with the coastal shallows and small islands of ancient Europe.
Split into simpler sentences: Many coastal shallows were created, and that caused Icthyosaurs to die out. Some island-hopping dinosaurs, like Eustreptospondylus, evolved to cope with the coastal shallows and small islands of ancient Europe.