Complex sentence: He wrote his autobiography, called "A healthy grave" "A healthy grave", back cover: however his health had never recovered from the harsh treatment while in prison awaiting trial, and he died of a massive heart attack in 1975.
Split into simpler sentences: He wrote his autobiography "A healthy grave" "A healthy grave", back cover. His health had never recovered from the harsh treatment while in prison awaiting trial, and he died of a massive heart attack in 1975.