Complex sentence: The Behavioral Risk Factor Surveillance System (BRFSS) is a United States national health survey that looks at behavioral risk factors that is run by Centers for Disease Control and Prevention and conducted by the individual states.
Split into simpler sentences: The Behavioral Risk Factor Surveillance System (BRFSS) is a United States national health survey that looks at behavioral risk factors. It is run by Centers for Disease Control and Prevention and conducted by the individual states.