Original sentence: Spiritism is defined by Spiritist Doctrine as the collection of principles and laws, considered to be revealed by Superior Spirits, contained in the works of Allan Kardec, which constitute the Codification of Spiritism: The Spirits' Book, The Mediums' Book, The Gospel According to Spiritism, Heaven and Hell and The Genesis According to Spiritism
Edited sentence: It is the collection of principles and laws, as considered to be revealed by the Superior Spirits, contained in the works of Allan Kardec, which constitute the Codification of Spiritism: The Spirits' Book, The Mediums' Book, The Gospel According to Spiritism, Heaven and Hell and The Genesis According to Spiritism