The colonies they create with their skeletons can make enormous reef-complexes, such as the Florida Keys, the Australian Great Barrier Reef, and many coral islands in the Pacific Ocean.
(The colonies; create; they) (The colonies they create with their skeletons; can make; enormous reef-complexes, such as the Florida Keys, the Australian Great Barrier Reef, and many coral islands in the Pacific Ocean) (Barrier Reef; [is] Great [from]; Australia)
The colonies The colonies they create with their skeletons Barrier Reef
create can make [is] Great [from]
they
enormous reef-complexes, such as the Florida Keys, the Australian Great Barrier Reef, and many coral islands in the Pacific Ocean
Australia