Complex sentence: Friedreich's ataxia is an autosomal recessive inherited disease that causes progressive damage to the nervous system, resulting in symptoms ranging from gait disturbance to speech problems; it can also lead to scoliosis, heart disease and diabetes, but does not affect cognitive function.
Split into simpler sentences: Friedreich's ataxia is an autosomal recessive inherited disease that causes progressive damage to the nervous system. It manifests in initial symptoms of poor coordination such as gait disturbance; it can also lead to scoliosis, heart disease and diabetes, but does not affect cognitive function.