This route follows a pretty direct line in a large dihedral, and then over a roof. It's on the right half of the east face of The Sentinel.This is a great route, with the crux in the lower half of the dihedral, and an incredible no-hands "head rest" just below the roof.
There were some cheater stones on the ledge at the base of the dihedral last I did the climb. Great route, really tricky getting started in the dihedral, but well protected all the way.
I led this route many years ago and again yesterday. I believe the first moves at the start of the dihedral are 5.10a. Those I've climbed it with concur.
Pretty typical J-tree 5.9. Slightly awkward, varied climbing. Kind of a long pitch, and a circuitious walk off that goes a bit right from the top of the route to gain the top of the formation, then goes back left to the south end of Sentinel to descend low angle terrain.
If you are inclined to rappell there are chain anchors on the southwest part of the formation. A little scrambling and down climbing to the opposite side of the formation (climbers right of Western Saga) will lead you to the rap. Did it with a 70m but am sure a 60m would be fine.