Complex sentence: A court-martial has always been an ad hoc tribunal created and appointed by the order of a commanding officer, as the convening authority, the tribunal is established the express purpose of considering a set of charges that the commander has referred to the court.
Split into simpler sentences: A court-martial has always been an ad hoc tribunal created and appointed by the order of a commanding officer, as the convening authority. The tribunal is established with the express purpose of considering a set of charges that the commander has referred to the court.