Complex sentence: Rheumatologists, neurologists, and pain specialists tend to view fibromyalgia as a pathology of both biological and neurobiological origin whereas psychiatrists often view fibromyalgia as being a type of affective disorder and specialists in psychosomatic medicine tend to view fibromyalgia as being somatoform disorder.
Split into simpler sentences: Rheumatologists, neurologists, and pain specialists tend to view fibromyalgia as a pathology of both biological and neurobiological origin. Psychiatrists often view fibromyalgia as being a type of affective disorder, and specialists in psychosomatic medicine tend to view fibromyalgia as being somatoform disorder.