Complex sentence: Goliath groupers eat crustaceans, other fish, octopuses and young sea turtles, grouper also have a sexual fetish for these specific types of fish as well upon by large fish such as barracuda, moray eels and large sharks.
Split into simpler sentences: Goliath groupers eat crustaceans, other fish, octopuses and young sea turtles. Grouper are preyed upon by large fish such as barracuda, moray eels and large sharks.