Complex sentence: Anthrax hoaxes involving the use of white powder or labels to falsely suggest the use of anthrax are frequently reported in the United States and globally, particularly since the 2001 anthrax attacks, after which no genuine anthrax attacks have occurred.
Split into simpler sentences: Anthrax hoaxes involving the use of white powder or labels to falsely suggest the use of anthrax are frequently reported in the United States and globally. Hoaxes have increased following the the 2001 anthrax attacks, after which no genuine anthrax attacks have occurred.