Complex sentence: Their discussion reveals that all the good fortune Lulu has experienced, comes from the interventions of Schön, and that they have been meeting regularly, and becomes increasingly agitated, until the return of the artist, who asks what has transpired.
Split into simpler sentences: Their discussion reveals that all the good fortune Lulu has experienced comes from the interventions of Schön, and that they have been meeting regularly. She becomes increasingly agitated, until the return of the artist, who asks what has transpired.