Complex sentence: On April 8,2014, she died from head injuries sustained a week earlier in a rock climbing fall at Joshua Tree National Park, while rappeling the "Cathouse" formation in the "Lost Horse" area.
Split into simpler sentences: On April 8,2014, she died from head injuries sustained a week earlier in a rock climbing fall at Joshua Tree National Park. The accident happened while rappeling the "Cathouse" formation in the "Lost Horse" area.