Complex sentence: Initially, his father had thought that Scientology was similar to Dale Carnegie's techniques, however, after his ordeal, Dr. Lottick now believes that the organization is a "school for psychopaths".
Split into simpler sentences: Initially, his father had thought that Scientology was similar to Dale Carnegie's techniques. However, after his ordeal, Dr. Lottick now believes that the organization is a "school for psychopaths".