Complex sentence: Hiking and horseback riding are the primary means of accessing the interior of the range, and the most frequently used route for such activities lies in Whipple Wash ("see photo above") which bisects the range from southwest to northeast.
Split into simpler sentences: Hiking and horseback riding are the primary means of accessing the interior of the range. The most frequently used route for these activities lies in Whipple Wash ("see photo") which bisects the range from southwest to northeast.