Complex sentence: It includes a battle between good and evil or Christ and Satan, in which she illustrates the powers of Satan to be similar to if not equal to those of Christ in causing a person to do evil, whereas Christ would have them doing good.
Split into simpler sentences: It includes a battle between good and evil or Christ and Satan. In which she illustrates the powers of Satan to be similar to if not equal in controlling a person to do evil where as Christ would have them doing good.