Complex sentence: He may also have been the founder of the monastery of Bangor-on-Dee (Bangor Iscoed or Is-y-coed), Flintshire, though whether the early abbot there named Saint Dunod was his father or not is unclear.
Split into simpler sentences: He may also have been the founder of the monastery of Bangor-on-Dee (Bangor Iscoed or Is-y-coed), Flintshire. Whether the early abbot there named Saint Dunod was his father is unclear.