Complex sentence: Upon arriving in Fawcett, he finds that Captain Marvel is fighting the same group of thieves; together, Superman and Marvel dispatch a pair of monsters and, after which, they take a break from crime fighting to chat at Mt.
Split into simpler sentences: Upon arriving in Fawcett, he finds Captain Marvel fighting the same group of thieves. Together, Superman and Marvel dispatch a pair of monsters and, after which, they take a break from crime fighting to chat at Mt.