Complex sentence: Jane Margaret Byrne (née Burke; May 24,1933--November 14,2014) was an American politician who was Mayor of Chicago from April 16,1979 to April 29,1983.
Split into simpler sentences: Jane Margaret Byrne (née Burke; May 24,1933--November 14,2014) was an American politician who was Mayor of Chicago. She served in office from April 16,1979 to April 29,1983.