Original: On the other hand, Jon Atack considered the sources of Scientology to be a mixture of Freud's abreaction therapy, science fiction, Buddhist ideas, and Aleister Crowley's magick.
Simplified: On the other hand, Jon Atack considered the sources of Scientology to be a mixture of Freud's abreaction treatment, science fiction, Buddhist ideas, and Aleister Crowley's magick.