Complex sentence: It was formerly Buckingham County, one of the 18 counties of Tasmania and one of the first eleven proclaimed in 1836 and is bordered to the north by the Derwent River, and to the south by the Huon River.
Split into simpler sentences: It was formerly Buckingham County, one of the 18 counties of Tasmania. It bordered to the north by the Derwent River, and to the south by the Huon River.