Complex sentence: It is widely used, mainly in European countries, for the relief of moderate to severe pain as an alternative to opioid analgesic drugs, and also has additional action in the prevention of shivering, which may be a side effect of other drugs used in surgery.
Split into simpler sentences: It is widely used, mainly in European countries, for the relief of moderate to severe pain as an alternative to opioid analgesic drugs. It also has additional action in the prevention of shivering, which may be a side effect of other drugs used in surgery.