Complex sentence: It then flows north between the Toiyabe Range and the Shoshone Mountains for approximately half its length, then passes through a low point in the Shoshone Mountains and continues north between that range and the Fish Creek Mountains.
Split into simpler sentences: It then flows north between the Toiyabe Range and the Shoshone Mountains for approximately half its length. The river then passes through a low point in the Shoshone Mountains and continues north between that range and the Fish Creek Mountains.