Complex sentence: John Eric Ensign, DVM (born March 25,1958) is a former United States Senator from Nevada, serving from January 2001 until he resigned in May 2011 amid an investigation of an ethics violation related to an extramarital affair.
Split into simpler sentences: John Eric Ensign, DVM (born March 25,1958) is a former United States Senator from Nevada, serving from January 2001 to May 2011. He resigned during an investigation of an ethics violation related to an extramarital affair.