Complex sentence: Smith died at the Rockefeller Institute Hospital on October 4,1944 of a heart attack, at the age of 70, broken-hearted over the death of his wife from cancer five months earlier, on May 4,1944.
Split into simpler sentences: Smith died at the Rockefeller Institute Hospital on October 4,1944 of a heart attack, at the age of 70. He had been broken-hearted over the death of his wife from cancer five months earlier, on May 4,1944.