Complex sentence: While still at Cambridge University Mead read "Esoteric Buddhism" by Alfred Percy Sinnett, 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.
Split into simpler sentences: While still at Cambridge University Mead read "Esoteric Buddhism" by Alfred Percy Sinnett. 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.