Complex sentence: In summer 1854, Morris travelled to Belgium to look at Medieval paintings, and in July 1855 went with Burne-Jones and Fulford across northern France, visiting Medieval churches and cathedrals.
Split into simpler sentences: In summer 1854, Morris travelled to Belgium to look at Medieval paintings. In July 1855 he then traveled with Burne-Jones and Fulford across northern France, visiting Medieval churches and cathedrals.