Original: The extreme steepness of the hillsides and strenuous nature of the boulder hopping on the lateral moraines and hillsides make this route's upper half the most difficult part of the Biafo - Hispar traverse.
Simplified: The extreme steepness of the hillsides and strenuous nature of the boulder hopping on the lateral moraines and hillsides make this routes upper half the most difficult part of the Biafo - Hispar traverse.