Complex sentence: The Yukon-Charley Rivers National Preserve is located in central Alaska along the border with Canada, encompassing 115 miles (185km) of the 1,800-mile (3,000km) Yukon River and the entire Charley River basin.
Split into simpler sentences: The Yukon-Charley Rivers National Preserve is located in central Alaska along the border with Canada. It encompassing 115 miles (185km) of the 1,800-mile (3,000km) Yukon River and the entire Charley River basin.