Complex sentence: Dr. Stewart David Nozette (born May 20,1957) is a convicted felon for espionage against the United States.Previously he was American scientist and astronomer, who worked for the United States Department of Energy, the United States Department of Defense, DARPA and NASA.
Split into simpler sentences: Dr. Stewart David Nozette (born May 20,1957) is an American scientist and astronomer. He has worked for the United States Department of Energy, the United States Department of Defense, and NASA.