Complex sentence: In the 1950s, a young Philip Masters (the Puppet Master) obtained clay from the mountain that had been granted mystical power by Chthon's presence; he would use this clay in his attempts to conquer the Fantastic Four.
Split into simpler sentences: In the 1950s, a young Philip Masters (the Puppet Master) obtained clay from the mountain that had been granted mystical power by Chthon's presence. He would use this clay in his attempts to conquer the Fantastic Four.