Complex sentence: Proponents of est asserted that it had a profoundly positive impact on people's lives, while some critics characterized the training methods as brainwashing, and suggested that the program had fascistic and narcissistic tendencies.
Split into simpler sentences: Proponents of est asserted that it had a profoundly positive impact on people's lives. Some critics characterized the training methods as brainwashing, and suggested that the program had fascistic and narcissistic tendencies.