Complex sentence: Feeling necessary for the first time in a long time, he devotes himself to the team, to help look over the wild magic of the "Tenth Age"; a direct result of the events of'Day of Vengeance'.
Split into simpler sentences: Feeling necessary for the first time in a long time, he devotes himself to the team. One of the goals they take on is to help look over the wild magic of the "Tenth Age"; a direct result of the events of'Day of Vengeance'.