Complex sentence: The highest point in the group is the summit of "Great Trango Tower" at 6,286 m (20,608 ft), the east face of which features the world's greatest nearly vertical drop.
Split into simpler sentences: The highest point in the group is the summit of "Great Trango Tower" at 6,286 m (20,608 ft). The east face of the Great Trango Tower features the world's greatest nearly vertical drop.