Complex sentence: The new members of the Night's Watch are finally given their assignments in the Wall and take their oaths; however, much to Jon's disappointment and anger, he has been assigned as a steward to the Lord Commander instead of a ranger.
Split into simpler sentences: The new members of the Night's Watch are finally given their assignments in the Wall and take their oaths. However, much to Jon's disappointment and anger, he has been assigned as a steward to the Lord Commander instead of a ranger.