Complex sentence: The Tower is world renowned as a subject for photography and for its classic rock climbing routes, the most famous of which is the Kor-Ingalls Route featured in Fifty Classic Climbs of North America.
Split into simpler sentences: The Tower is world renowned as a subject for photography and for its classic rock climbing routes. The most famous of the Castleton Tower rock climbing routes is the Kor-Ingalls Route featured in Fifty Classic Climbs of North America.