Complex sentence: He directed the National Institute of Environmental Health Sciences in 1971 and started the National Toxicology Program in 1978, and held the rank of Assistant Surgeon General in the United States Public Health Service.
Split into simpler sentences: He directed the National Institute of Environmental Health Sciences in 1971 and started the National Toxicology Program in 1978. He held the rank of Assistant Surgeon General in the United States Public Health Service.