Complex sentence: The Port Henderson hill, apart from the Salt pond hill is visible from neighbouring parishes and was a possible Arawak grave site because the Arawak buried their dead in caverns, which Port Henderson hill is riddled with.
Split into simpler sentences: The Port Henderson hill, apart from the Salt pond hill is visible from neighbouring parishes and was a possible Arawak grave site. Because the Arawak buried their dead in caverns, which Port Henderson hill is riddled with.