Complex sentence: Majority of the routes in the gorge are for advanced climbers in 5.10-5.12 range of Yosemite Decimal System with about equal number of traditional and sport climbs.
Split into simpler sentences: Majority of the routes in the gorge are for advanced climbers in 5.10-5.12 range of Yosemite Decimal System. With about equal number of traditional and sport climbs.