If you don’t have dissection equipment, I’d just use a thin nail or toothpick (two of either) to tease apart the pellet and separate any bones or maybe insect parts from matted hair. Do it in a shallow tray. You can store the bones/ hard parts in a plastic vial, like a medicine bottle and discard the rest. If you’re lucky there might be an intact small mammal skull. It’s not difficult, just do it carefully.
I looked at your photos. Appears like a rodent skull/mandible and other bones.