Complex sentence: In 2009, the state environmental regulators SCDHEC noted fish species in Lake Wateree contained exceptionally high levels of PCB contamination and posted adviseries that fish from the lake were unsafe to eat.
Split into simpler sentences: In 2009, the State Environmental regulators noted fish species in Lake Wateree contained exceptionally high levels of PCB contamination. The contamination was so bad that authorities posted adviseries that fish from the lake were unsafe to eat.