Complex sentence: This comprehensive theosophical account of the Eastern religion prompted Mead to contact two theosophists in London named Bertam Keightly and Mohini Chatterji, which eventually led him to join Helena Petrovna Blavatsky's Theosophical Society in 1884.
Split into simpler sentences: This comprehensive theosophical account of the eastern religion prompted Mead to contact two theosophists in London named Bertam Keightly and Mohini Chatterji, which eventually led him to join the Theosophical Society. Mead became a member of Helena Petrovna Blavatsky's Theosophical Society in 1884.