Complex sentence: He annotated the "Annals of Laon," the computistical works of Bede, wrote a commentary on Martianus Capella's "De nuptiis Philologiae et Mercurii", and preserved fragments of a lost commentary on Virgil by Aelius Donatus.
Split into simpler sentences: He annotated the "Annals of Laon," the computistical works of Bede. He also provided a commentary on Martianus Capella's "De nuptiis Philologiae et Mercurii" and preserved fragments of a lost commentary on Virgil by Aelius Donatus.