Original sentence: Considered one of the Canyon's most strenuous trails, it is covered with heavy brush and subject to rockslides.No services are available, and the only reliable water is at the Colorado River, which must be treated before consuming.This 14-mile trail is considered difficult, and requires considerable route-finding expertise
Edited sentence: A major reconstruction effort by a volunteer crew in 2005 restored much of the original trailbed, improving travel and navigation, but still one of the Canyon's most strenuous trails and providing access to an exceptional wilderness area.No services are available, water sources include perennial flow in Shinumo Creek and at the Colorado River, which must be treated before consuming.This 14-mile trail is considered difficult, primarily due to length and elevation.Until recently the trail was very eroded and required considerable route-finding expertise