Complex sentence: The Pista Stelvio, named after Stelvio Pass, is one of the most challenging downhill courses in the world; it is second-longest on the World Cup circuit, behind only the Lauberhorn in Wengen, Switzerland.
Split into simpler sentences: The Pista Stelvio, named after Stelvio Pass, is one of the most challenging downhill courses in the world. It is second-longest course on the World Cup circuit, behind only the Lauberhorn in Wengen, Switzerland.