Complex sentence: Snoezelen or controlled multisensory stimulation is used for people with (severe) mental disabilities, and involves exposing them to a soothing and stimulating environment, the "snoezelen room".
Split into simpler sentences: Snoezelen or controlled multisensory stimulation is used for people with (severe) mental disabilities. The room exposes users to a soothing and stimulating environment-the "snoezelen room".