Complex sentence: After retiring from his long military service, he would later served as professor of Political science at the National Defence University (NDU) in Islamabad before being appointed as Pakistan Ambassador to the United States from November 2004 until June 2006.
Split into simpler sentences: After retiring from military service, he served as a professor of Political science at the National Defence University (NDU) in Islamabad. In 2004 he was appointed as Pakistan's Ambassador to the United States where he served from November 2004 until June 2006.