Complex sentence: Laws and ordinances are promulgated by two Cabinet members in unison signing "On Behalf of the Government" and the government--not the monarch--is the high contracting party with respect to international treaties.
Split into simpler sentences: Laws and ordinances are promulgated by two cabinet members in unison signing "On Behalf of the Government". The Governmentnot the Kingis the high contracting party with respect to international treaties.