Complex sentence: Oral medicine is concerned with clinical diagnosis and non-surgical management of non-dental pathologies affecting the orofacial region (the mouth and the lower face), such as oral lichen planus, Behçet's disease and pemphigus vulgaris.
Split into simpler sentences: Oral medicine is concerned with clinical diagnosis and non-surgical management of non-dental pathologies affecting the orofacial region (the mouth and the lower face). Example conditions that oral medicine is concerned with are lichen planus, Behçet's disease and pemphigus vulgaris.