Complex sentence: She appeared in 15 films and TV plays between 1941 and 1957, she would start to develop severe stage fright shortly after that then spent the last twenty years of her life mainly with public book readings, in churches and theaters as well as more radio work.
Split into simpler sentences: She appeared in 15 films and TV plays between 1941 and 1957. She would start to develop severe stage fright shortly after that then spent the last twenty years of her life mainly with public book readings, in churches and theaters as well as more radio work.