Complex sentence: The World Health Organization (WHO) recommends a "pain ladder" for managing analgesia which was first described for use in cancer pain, but can be used by medical professionals as a general principle when dealing with analgesia for any type of pain.
Split into simpler sentences: The World Health Organization (WHO) recommends a "pain ladder" for managing analgesia. It was first described for use in cancer pain, but it can be used by medical professionals as a general principle when dealing with analgesia for any type of pain.