Complex sentence: Crowley later attributed the 26 letters of the English alphabet to these trigrams, in an attempt to fulfill an injunction found in his earlier work The Book of the Law, or Liber AL vel Legis.
Split into simpler sentences: Crowley later attributed the 26 letters of the English alphabet to these trigrams. This attribution was an attempt to fulfill the injunction found in Crowley's earlier work The Book of the Law, or Liber AL vel Legis.