Complex sentence: Chaplin retained tremendous affection for Edna Purviance, and kept her on his payroll until her death from cancer on January 13,1958, at the age of 62 (as per her official California death certificate).
Split into simpler sentences: Chaplin retained tremendous affection for her, and kept her on his payroll until her death. She died of cancer on January 13,1958, at the age of 62 (as per her official California death certificate).