Complex sentence: However as Hinterstoisser set up the last stage of the descent an avalanche came down the mountain, wiping out Hinterstoisser who had unclipped from the group, he fell to his death and was found at the bottom of the mountain days later.
Split into simpler sentences: However as Hinterstoisser set up the last stage of the descent an avalanche came down the mountain, wiping out Hinterstoisser, who had unclipped from the group. He fell to his death and was found at the bottom of the mountain days later.