Complex sentence: Wilfrid, the bishop of York, had been exiled by Ecgfrith for his role in persuading Ecgfrith's wife, Æthelthryth to remain a saintly celibate, but in 686, at the urging of Archbishop Theodore, Aldfrith allowed Wilfrid to return.
Split into simpler sentences: Wilfrid, the bishop of York, had been exiled by Ecgfrith for his role in persuading Ecgfrith's wife, Æthelthryth, to remain a saintly celibate. In 686, at the urging of Archbishop Theodore, Aldfrith allowed Wilfrid to return.