Complex sentence: The turtle is restricted to rivers draining into the Gulf of Carpentaria in the Northern Territory and Queensland, from the Nicholson to Calvert River systems in the Northern Territory, to the Gregory River in Queensland.
Split into simpler sentences: The turtle is restricted to rivers draining into the Gulf of Carpentaria in the Northern Territory and Queensland. These rivers range from the Nicholson to Calvert River systems in the Northern Territory to the Gregory River in Queensland.