Complex sentence: In the end, the Burne-Joneses remained together for another 30 years, as did the Morrises, but Morris and Georgiana remained close for the rest of his life.
Split into simpler sentences: In the end, the Burne-Joneses remained together for another 30 years, as did the Morrises. William Morris and Georgiana remained close friends for the rest of his life.