Complex sentence: The hostel and cafe that once operated on the island have been closed as a result of a dispute between the Irish State which wishes to make the island a national park and an individual who claims to own the greater part of the island.
Split into simpler sentences: The hostel and cafe that once operated on the island have been closed. This is a result of the ongoing dispute between the Irish State which wishes to make the island a national park and an individual who claims to own the greater part of the island.