Complex sentence: When a group of teenagers are banished from their tribe, they stumble upon a solar-powered city, whose two inhabitants have been genetically modified to survive the plague, turning them into superhuman mutants who intend to recreate humanity in their own image.
Split into simpler sentences: When a group of teenagers are banished from their tribe, they eventually stumble upon a solar-powered city. They view themselves as superhuman mutants who intend to recreate humanity in their own image.