Complex sentence: Self-ownership (or sovereignty of the individual, individual sovereignty or individual autonomy) is the moral or natural right of a person to be the exclusive controller of his or her own body and life.
Split into simpler sentences: Self-ownership (or sovereignty of the individual, individual sovereignty or individual autonomy) is the concept of property in one's own person. It is the moral or natural right of a person to be the exclusive controller of his or her own body and life.