Complex sentence: Much of the island has been declared as Rapa Nui National Park, and on 22 March 1996 UNESCO designated it as a World Heritage Site as a Cultural Heritage under criteria: (i), (iii), & (v).
Split into simpler sentences: Much of the island has been declared as Rapa Nui National Park. On 22 March 1996 UNESCO designated it a World Heritage Site of cultural significance under criteria (i), (iii), & (v).