Complex sentence: A special election for Massachusetts's 5th congressional district will take place at an undetermined date in the fall of 2013, due to the resignation of Democratic U.S. Rep. Ed Markey following his election to the United States Senate in a special election on June 25,2013.
Split into simpler sentences: A special election for Massachusetts's 5th congressional district will take place at an undetermined date in the fall of 2013, due to the resignation of Democratic U.S. Rep. Ed Markey. Markey will resign in June 2013 after his election to the United States Senate in a special election on June 25,2013.