Complex sentence: Later he was transformed into Kurse by the Beyonder, a virtually omnipotent alien being, giving him vastly greater strenght, said to be twice Thor's (Thor himself is vastly powerful, able to lift over 100 tons).
Split into simpler sentences: Later he was transformed into Kurse by the Beyonder, a virtually omnipotent alien being, giving him vastly greater strength. Kurse was said to be twice as strong as Thor (Thor himself is vastly powerful, able to lift over 100 tons).