Complex sentence: He had no sympathy with the younger school of poets who were in revolt against the artificial methods of the 18th century, and he was responsible for the famous "Quarterly" article on John Keats's "Endymion".
Split into simpler sentences: He had no sympathy with the younger school of poets who were in revolt against the artificial methods of the 18th century. He was also responsible for the famous "Quarterly" article on John Keats's "Endymion".