Complex sentence: He was awarded the National Medal of Science in 2000 by President of the United States Bill Clinton and received the Arthur C. Cope Award for achievement in the field of organic chemistry research from the American Chemical Society in 1999.
Split into simpler sentences: He was awarded the National Medal of Science in 2000 by President of the United States Bill Clinton. Hirschmann received the Arthur C. Cope Award for achievement in the field of organic chemistry research from the American Chemical Society in 1999.