Complex sentence: In 2001, young French Snowboarder Marco Siffredi succeed in the first Snowboard descent of the Everest by using the Norton Couloir, he died the following year attempding a new descent via Hornbein Couloir.
Split into simpler sentences: In 2001, young French snowboarder Marco Siffredi succeeded in the first snowboard descent of Everest by using the Norton Couloir. He died the following year attempting a new descent via Hornbein Couloir.