Complex sentence: Edentulism is the condition of being toothless to at least some degree; loss of some teeth results in "partial edentulism", while loss of all teeth results in "complete edentulism".
Split into simpler sentences: Edentulism is the condition of being toothless to at least some degree; it is the result of tooth loss. Loss of some teeth results in "partial edentulism", while loss of all teeth results in "complete edentulism".