Complex sentence: Thus the use of violence is unprohibited throughout the realm and is only checked by the threat of retaliatory violence or nonviolent sanctions (see Gene Sharp), so where no such threat exists a nation may use violence against another.
Split into simpler sentences: Thus the use of violence is unprohibited throughout the realm and is only checked by the threat of retaliatory actions. Where no such threat exists a nation may freely use violence against another.