Complex sentence: Previously, sensorineural hearing loss has been treated with hearing aids, which amplify sounds at preset frequencies to overcome a sensorineural hearing loss in that range; or cochlear implants, which stimulate cochlear nerves directly.
Split into simpler sentences: Previously, sensorineural hearing loss has been treated with hearing aids, which amplify sounds at preset frequencies to overcome a sensorineural hearing loss in that range. It can also be treated with cochlear implants, which stimulate cochlear nerves directly.