Complex sentence: He specializes in the study of new religious movements including cults and has been very critical on the internet and elsewhere about several groups such as Eckankar, the Movement of Spiritual Inner Awareness, Radhasoami gurus, and the Indian guru Sathya Sai Baba.
Split into simpler sentences: He specializes in the study of new religious movements including cults. He has been very critical about several groups such as Eckankar, Radhasoami gurus and the Indian guru Sathya Sai Baba.