Simplify the following text for a Grade 8 native English-speaking person.
Original: Europe 's most complete Neolithic village , Skara Brae gained UNESCO World Heritage Site status as one of four sites comprising `` The Heart of Neolithic Orkney . ''
Simplified: It is Europe 's most complete Neolithic village . The level of preservation is such that it is a main part of the UNESCO World Heritage Site of the Heart of Neolithic Orkney .