Complex sentence: King Edgar the Peaceful re-founded the abbey under the Rule of Benedict in 967, appointing as abbess a noblewoman named Merewenna, who also given charge his step-daughter, Aethelflaed, who later served as abbess herself.
Split into simpler sentences: King Edgar the Peaceful re-founded the abbey under the Rule of Benedict in 967, appointing as abbess a noblewoman named Merewenna. Merewanna was given charge of King Edgar's step-daughter, Aethelflaed, who later served as abbess herself.