Complex sentence: He is revered by some as a "spiritual master" and believed to be'Dattatreya Avatara' by his devotees, who claim he has the devotion of "millions" of devotees around the world.
Split into simpler sentences: He is revered by some as a "spiritual master" and believed to be'Dattatreya Avatara' by his devotee. It is claimed that he has the devotion of "millions" of devotees around the world.