Complex sentence: Margaret Mackall Smith "Peggy" Taylor (September 21,1788--August 14,1852), wife of Zachary Taylor, was First Lady of the United States from 1849 to 1850.
Split into simpler sentences: Margaret Mackall Smith "Peggy" Taylor (September 21,1788--August 14,1852) was the wife of Zachary Taylor. She was First Lady of the United States from 1849 to 1850.