Complex sentence: It was a great relief for the diocese and the Parish not only because the cause of great worry for the future of the middle school passed students was over and also the Diocese and the Jesuits felt that the school was in safe hands.
Split into simpler sentences: It was a great relief for the diocese and the Parish. Now this cause of great worry for the future of the middle school students passed; the Diocese and the Jesuits also felt that the school was in safe hands.