Complex sentence: As soon as the diagnosis was made, the entire staff of Willard Parker Hospital was vaccinated for smallpox, while the New York City Health Department and the U.S. Public Health Service were notified.
Split into simpler sentences: As soon as the diagnosis was made, the entire staff of Willard Parker Hospital was vaccinated for smallpox. The New York City Health Department and the U.S. Public Health Service were notified.