Complex sentence: The Cache Valley is an agricultural valley of northern Utah and southeast Idaho which includes the Logan metropolitan area and was used by 19th century mountain men and was the site of the 1863 Bear River Massacre.
Split into simpler sentences: The Cache Valley is an agricultural valley of northern Utah and southeast Idaho which includes the Logan metropolitan area. The valley was used by 19th century mountain men and was the site of the 1863 Bear River Massacre.