Complex sentence: He founded the Pre-Raphaelite Brotherhood in 1848 with William Holman Hunt and John Everett Millais, and was later to be the main inspiration for a second generation of artists and writers influenced by the movement, most notably William Morris and Edward Burne-Jones.
Split into simpler sentences: He founded the Pre-Raphaelite Brotherhood in 1848 with William Holman Hunt and John Everett Millais. Rossetti was later to be the main inspiration for a second generation of artists and writers influenced by the movement, most notably William Morris and Edward Burne-Jones.