Complex sentence: A motor neuron disease (MND) is any of five neurological disorders that selectively affect motor neurons, the cells that control voluntary muscles of the body: amyotrophic lateral sclerosis, primary lateral sclerosis, progressive muscular atrophy, progressive bulbar palsy and pseudobulbar palsy.
Split into simpler sentences: A motor neuron disease (MND) is any of five neurological disorders that selectively affect motor neurons, the cells that control voluntary muscles of the body. These five conditions are amyotrophic lateral sclerosis, primary lateral sclerosis, progressive muscular atrophy, progressive bulbar palsy and pseudobulbar palsy.