Complex sentence: Legend has it thet Slogen was first climbed in 1870 by Jon Klokk and later on that year by the famous climber and alpine explorer William Cecil Slingsby.
Split into simpler sentences: Legend has it that Slogen was first climbed in 1870 by Jon Klokk. Later on that year it was climbed by the famous climber and alpine explorer William Cecil Slingsby.