Complex sentence: In 2007, the Australian Federal Police and Australia's attorneys-general investigated whether a box set of 16 DVDs of Mohammed's sermons, called the "Death Series", broke laws against sedition, racial vilification, and inciting violence and terrorism.
Split into simpler sentences: In 2007, a box set of 16 DVDs of Mohammed's sermons, called the "Death Series", became the focus of the Attorney General of Australia. The Australian Federal Police and Australia's Attorney General investigated whether Mohammed's sermons broke laws against sedition, racial vilification, and inciting violence and terrorism.