Complex sentence: Nancy Davis Reagan (born Anne Frances Robbins, July 6,1921) is a former actress and the widow of the 40th President of the United States, Ronald Reagan, First Lady of the United States from 1981 to 1989.
Split into simpler sentences: Nancy Davis Reagan (born Anne Frances Robbins, July 6,1921) is a former actress and the widow of the 40th President of the United States, Ronald Reagan. She was the First Lady of the United States from 1981 to 1989.