Complex sentence: Should one member be attacked, it had to be helped with military or alternatively legal support DukeMaximilian was to be the president, and the Prince Bishops of Augsburg, Passau, and Würzburg his councilors.
Split into simpler sentences: Should one member be attacked, it had to be helped with military or alternatively legal support. Duke Maximilian was to be the president, and the Prince Bishops of Augsburg, Passau, and Würzburg his councilors.