Complex sentence: Duloxetine alleviates pain associated with diabetic neuropathy and fibromyalgia; however, its efficacy relative to the established treatments, such as anticonvulsants and tricyclic antidepressants, has not been studied.
Split into simpler sentences: Duloxetine alleviates pain associated with diabetic neuropathy and fibromyalgia. Its efficacy relative to established treatments such as anticonvulsants and tricyclic antidepressants, however, has not been studied.