Complex sentence: While here they are forced by bank robbers, Mugsy and Harry, to fly to Venus where they find a race of semi-eternal Amazonian aliens who have banished all of the men from their world.
Split into simpler sentences: While here they are forced by bank robbers Mugsy and Harry to fly to Venus. Here they find a race of semi-eternal Amazonian aliens who have banished all of the men from their world.