Complex sentence: An excited group of vacationers arrive overwhelmed at everything that Phantasma has to offer, and speculate about its reclusive, masked owner and creator, a wealthy tycoon known only as Mr. Y ("Heaven by the Sea").
Split into simpler sentences: An excited group of vacationers arrive, overwhelmed at all that Phantasma has to offer. They speculate about the park's reclusive, masked owner and creator, a wealthy tycoon known only as Mr. Y ("Heaven by the Sea").