Original sentence: () There exits mountain bike racing types that are not recognized by UCI, like mountain bike orienteering that is governed by IOF.In 1996, cross country mountain biking events were added to the Olympic Games.In 2006 cross country mountain biking events will become part of the World Deaf Cycling Championships for the first time in San Francisco, USA.Its nine-race circuit covered two continents - Europe and North America - and was sponsored by Grundig.There are three USA Cycling Mountain Bike National Calendars- Endurance, Gravity and Ultra-Endurance
Edited sentence: () There are mountain bike racing types that are not recognized by the UCI, such as mountain bike orienteering, that are governed by the IOF.In 1996, cross-country mountain biking events were added to the Olympic Games.In 2006, cross-country mountain biking events became part of the World Deaf Cycling Championships for the first time in San Francisco, USA.Its nine-race circuit covered two continents—Europe and North America—and was sponsored by Grundig.John Tomac.There are three USA Cycling Mountain Bike National Calendars: Endurance, Gravity and Ultra-Endurance