Complex sentence: As a result of the groundwater contamination at Byron and Braidwood, the state of Illinois took action through legislation, and on April 12 2006 the Illinois Environmental Protection Agency (IEPA) issued a violation notice to Exelon concerning Byron Nuclear Generating Station.
Split into simpler sentences: As a result of the groundwater contamination at Byron, and Braidwood, the state of Illinois took action through legislation and its environmental protection agency (EPA). On April 12,2006 the Illinois Environmental Protection Agency (IEPA) issued a violation notice to Exelon concerning Byron Nuclear Generating Station.