Complex sentence: He witnessed charters of Alan II, Duke of Brittany, and on the latter's death apparently fell under the control of Wicohen, Archbishop of Dol, later sources reporting the rescue of Judicael and his (unnamed) wife by son Conan.
Split into simpler sentences: He witnessed charters of Alan II, Duke of Brittany, and on the latter's death apparently fell under the control of Wicohen, Archbishop of Dol. Later sources reporting the rescue of Judicael and his (unnamed) wife by son Conan.