Complex sentence: Mrs. Wallace made her gubernatorial run carrying a tragic secret: she had been diagnosed with cancer as early as April 1961, when her surgeon biopsied suspicious tissue he noticed during the cesarean delivery of her last child.
Split into simpler sentences: Mrs. Wallace made her gubernatorial run carrying a tragic secret. She had been diagnosed with cancer as early as April 1961, when her surgeon biopsied suspicious tissue he noticed during the cesarean delivery of her last child.