Complex sentence: The first negotiator code named "Peter" Peter said that he had not been given important information, and had not been told that the Grand Mufti of Australia and a barrister who represented Monis had offered to help negotiate with Monis.
Split into simpler sentences: The first negotiator code named "Peter" said that he had not been given important information. He had not been told that the Grand Mufti of Australia and a barrister who represented Monis had offered to help negotiate with Monis.