Complex sentence: The selective dorsal rhizotomy (SDR) for spastic cerebral palsy, however, has been the main use of rhizotomy for neurosurgeons specialising in spastic CP since the 1980s; in this surgery, the spasticity-causing nerves are isolated and then targeted and destroyed.
Split into simpler sentences: The selective dorsal rhizotomy (SDR) for spastic cerebral palsy has been the main use of rhizotomy for neurosurgeons specialising in spastic CP since the 1980s. In this surgery, the spasticity-causing nerves are isolated and then targeted and destroyed.