Complex sentence: He was the owner and caretaker of Mount St. Helens Lodge at Spirit Lake, located at the south end of Spirit Lake at the foot of the mountain in the danger zone at the time of the eruption.
Split into simpler sentences: He was the owner and caretaker of Mount St. Helens Lodge at Spirit Lake. The lodge was located at the south end of Spirit Lake at the foot of the mountain and was in the danger zone at the time of the eruption.