Complex sentence: He was father of ealdorman Æthelmær Se Greatta and grandfather of Æthelnoth, who became Archbishop of Canterbury in 1020, and was later regarded as a saint.
Split into simpler sentences: He was father of ealdorman Æthelmær Se Greatta. His grandson was Æthelnoth, who became Archbishop of Canterbury in 1020, and was later regarded as a saint.