Complex sentence: In June 2012 the British Lung Foundation released a report that claimed "each cannabis cigarette increases the chances of developing lung cancer by as much as an entire packet of 20 tobacco cigarettes".
Split into simpler sentences: In June 2012 the British Lung Foundation released a report looking at the health impacts of smoking cannabis. In one section, the report claimed "each cannabis cigarette increases the chances of developing lung cancer by as much as an entire packet of 20 tobacco cigarettes".