Complex sentence: Lucius appears in later, particularly English literature such as Thomas Malory's "Le Morte d'Arthur", and the "Alliterative Morte Arthure", and a Roman Emperor defeated by King Arthur appears in French Arthurian literature as well, notably in the Vulgate Cycle.
Split into simpler sentences: Lucius appears in later, particularly English literature such as Thomas Malory's "Le Morte d'Arthur", and the "Alliterative Morte Arthure", as a Roman Emperor. An Emperor defeated by King Arthur appears in French Arthurian literature as well, notably in the Vulgate Cycle.