Complex sentence: The supraorbital ridge is a nodule or crest of bone situated on the frontal bone of the skull, forming the separation between the forehead portion itself (the squama frontalis) and the roof of the eye sockets (the pars orbitalis).
Split into simpler sentences: The supraorbital ridge is a nodule or crest of bone situated on the frontal bone of the skull. It forms the separation between the forehead portion itself (the squama frontalis) and the roof of the eye sockets (the pars orbitalis).