Complex sentence: In his letter, he announced that he would run again for state treasurer, but it is rumored that he switched parties to challenge the Democrat Mary Landrieu, who is seeking her third term in the U.S. Senate in 2008.
Split into simpler sentences: In his letter, he announced that he would run again for state Treasurer. But it is rumored that he switched parties to challenge the Democrat Mary Landrieu, who is seeking her third term in the U.S. Senate in 2008.