Complex sentence: His wife died in 1907 and Denney felt the loss deeply, from which he never recovered, writing only two major before his death in the summer of 1917 at the comparatively early age of sixty-one.
Split into simpler sentences: His wife died in 1907, and Denney felt the loss deeply. He was never the same again and he wrote only two major works between then and his own death in the summer of 1917 at the comparatively early age of sixty-one.