Complex sentence: Chorea (also known as St. Vitus dance) is an abnormal voluntary movement disorder, one of a group of neurological disorders called dyskinesias, which are caused by overactivity of the neurotransmitter dopamine in the areas of the brain that control movement.
Split into simpler sentences: Chorea (also known as St. Vitus dance) is an abnormal voluntary movement disorder, one of a group of neurological disorders called dyskinesias. These dissorders are caused by overactivity of the neurotransmitter dopamine in the areas of the brain that control movement.