Complex sentence: The rate of injury is approximately 1 injury per 100,000 Buckyball sets and less than 1 injury per 21.5 million individual magnet pieces, and the magnets are marketed exclusively for adults, with conspicuous labels warning of their danger to children.
Split into simpler sentences: The rate of injury is approximately 1 injury per 100,000 Buckyball sets and less than 1 injury per 21.5 million individual magnet pieces. The magnets are marketed to adults, with labels warning of their danger to children.