Complex sentence: The opinion issued by Commissioner Dennis Unsworth in October 2010 followed investigation of a 2008 complaint by a Great Falls attorney, which accused ATP of not properly disclosing financial information related to its fliers that criticized a state senator.
Split into simpler sentences: The opinion issued by Commissioner Dennis Unsworth in October 2010 followed investigation of a complaint filed in 2008 by an attorney from Great Falls. The complaint accused ATP of not properly disclosing financial information related to fliers it released that criticized a state senator.