Complex sentence: Much evidence of their habitation remains especially their rock etchings in Kuring-gai Chase National Park which borders Northern Beaches's north-western side.The Northern Beaches were explored early on in the settlement of Sydney, only a few weeks after the arrival of the First Fleet.
Split into simpler sentences: Much evidence of their habitation remains especially their rock etchings in Kuring-gai Chase National Park which borders northern beaches's north-western side. The northern beaches region was explored early on in the settlement of Sydney, only a few weeks after the arrival of the First Fleet.