Complex sentence: Dr. Basil Wilby, aka Gareth Knight (born 1930) is a British esotericist and occult author who began his esoteric training in 1953 as a member of the Fraternity of the Inner Light, founded by Dion Fortune.
Split into simpler sentences: Dr. Basil Wilby, aka Gareth Knight (born 1930) is a British esotericist and occult author. Knight began his esoteric training in 1953 as a member of the Fraternity of the Inner Light, founded by occultist Dion Fortune.