Complex sentence: In 20 years, they treated over 30,000 patients using suggestions under hypnosis, although over time Bernheim would make increasing use of suggestion in a waking state- "suggestion à l'état de veille".
Split into simpler sentences: In 20 years, they treated over 30,000 patients using suggestions under hypnosis. Over time however Bernheim would make increasing use of suggestion in a waking state- "suggestion à l'état de veille".