Complex sentence: After becoming aware of the Earth, the Beyonders began studying the Marvel Multiverse with amusement and curiosity and eventually hired the Pegasusian alien race as agents, to tow Counter-Earth to the Beyonders' museum.
Split into simpler sentences: After becoming aware of the Earth, the Beyonders began studying the Marvel Multiverse with amusement and curiosity. They eventually hired the Pegasusian alien race as agents, to tow Counter-Earth to the Beyonders' museum.