Complex sentence: As of November 2017, Ondra is the only climber to have redpointed a route with a proposed grade of ("Silence", September 3,2017), and he climbed 1464 routes between and, of which 3 were at and 3 were onsights at.
Split into simpler sentences: As of November 2017, Ondra is the only climber to have redpointed a route with a proposed grade of ("Silence", September 3,2017),. He climbed 1464 routes between and, of which 3 were at and 3 were onsights at.