Complex sentence: The four species grow naturally only in eastern Australia between Dorrigo in mid-northern New South Wales and the Wet Tropics rainforests region of north-eastern Queensland, in uplands and mountains rainforests, where they form part of the understory.
Split into simpler sentences: The four species grow naturally only in eastern Australia between Dorrigo in mid-northern New South Wales and the Wet Tropics rainforests region of north-eastern Queensland. They grow in uplands and mountains rainforests, where they form part of the understory.