Complex sentence: Sipadan is the only "oceanic island" in Malaysia; rising 2,000 feet or 600m from the seabed; it has been formed by living corals growing on top of an extinct "volcanic cone" that took thousands of years to develop.
Split into simpler sentences: Sipadan is the only "oceanic island" in Malaysia, rising 2,000 feet or 600m from the seabed. It was formed by living corals growing on top of an extinct "volcanic cone" that took thousands of years to develop.