Complex sentence: The report failed to assess other contaminants, such as benzene and vinyl chloride, and concluded that the water at the base was tainted between 1950 and 1985, but that the contamination could not be linked to any health problems.
Split into simpler sentences: The report failed to assess other contaminants, such as benzene and vinyl chloride. It stated that the water at the base was tainted between 1950 and 1985, but that the contamination could not be linked to any health problems.