Complex sentence: The main clinical features of FXTAS include problems of movement with cerebellar gait ataxia and action tremor, and associated features include parkinsonism, cognitive decline, and dysfunction of the autonomic nervous system.
Split into simpler sentences: The main clinical features of FXTAS include problems of movement with cerebellar gait ataxia and action tremor. Associated features include parkinsonism, cognitive decline, and dysfunction of the autonomic nervous system.