Complex sentence: In his efforts to shift from psychotherapeutic treatment to a spiritual, religious focus, he introduced the concept of thetans, a concept analogous to beliefs about spirits, and stated that the focus of Scientology was treating thetans.
Split into simpler sentences: In his efforts to shift from psychotherapeutic treatment to a spiritual, religious focus, he introduced the concept of thetans, a concept analogous to beliefs about spirits. He stated that the focus of Scientology was treating thetans.