Complex sentence: A 2012 review found a number of adverse events were reported after acupuncture in the UK's National Health Service (NHS) but most (95%) were not severe, though miscategorization and under-reporting may alter the total figures.
Split into simpler sentences: A 2012 review found a number of adverse events were reported after acupuncture in the UK's National Health Service (NHS) but most (95%) were not severe. Though, miscategorization and under-reporting may alter the total figures.