Complex sentence: The Nancy School is based around a hypnosis-centered approach to therapy in contrast to the previously used hysteria-centered approach, which was used by the Paris School as well as the Salpetriere Hospital.
Split into simpler sentences: The Nancy School is based around a hypnosis-centered approach to therapy in contrast to the previously used hysteria-centered approach. This approach was used by the Paris School as well as the Salpetriere Hospital.