Complex sentence: This undermined Openshaw's health, and the unexpected death of his wife in 1929 also so severely affected him that he developed diabetes and died of pneumonia a few months after his wife on 17 November 1929.
Split into simpler sentences: This undermined Openshaw's health, and the sudden death of his wife two years later weakened him further. He developed diabetes and died of pneumonia a few months after his wife on 17 November 1929.