Complex sentence: In central Alaska up the northern foothills at the Dry Creek site ca 13,500-13,000 years ago near Nenana Valley small bifacial points were found and its thought that people moved into this area to hunt elk and sheep on a seasonal basis.
Split into simpler sentences: In central Alaska up the northern foothills at the Dry Creek site ca 13,500-13,000 years ago near Nenana Valley, small bifacial points were found. It is thought that people moved into this area to hunt elk and sheep on a seasonal basis.