Complex sentence: Set 14 years after'and 5 years before', "Rebels" takes place during an era when the Galactic Empire is securing its grip on the galaxy and hunting down the last of the Jedi Knights while a fledgling rebellion against the Empire is taking form.
Split into simpler sentences: Set 14 years after'and 5 years before', "Rebels" takes place during an era when the Galactic Empire is securing its grip on the galaxy. Imperial forces are hunting down the last of the Jedi Knights while a fledgling rebellion against the Empire is taking form.