Complex sentence: The National Institute for Occupational Safety and Health (NIOSH) has recommended that 35 mg/m 3 of vanadium be considered immediately dangerous to life and health, that is, likely to cause permanent health problems or death.
Split into simpler sentences: The National Institute for Occupational Safety and Health (NIOSH) has recommended that 35 mg/m 3 of vanadium be considered immediately dangerous to life and health. This is the exposure level of a chemical that is likely to cause permanent health problems or death.