Complex sentence: Palpatine commands the clone troopers to execute a secret order he implanted in them to turn on their Jedi Generals and dispatches his new apprentice to kill everyone inside the Jedi Temple then assassinate the Separatist leaders on the planet Mustafar.
Split into simpler sentences: Palpatine commands the clone troopers to execute a secret order he implanted in them to turn on their Jedi Generals. He then dispatches his new apprentice to kill everyone inside the Jedi Temple and assassinate the Separatist leaders on the planet Mustafar.