Complex sentence: As a direct reaction to the Galactic Empire, the Alliance insurgency conducted covert operations Imperial garrison-worlds and guerrilla warfare against the Imperial Fleet throughout the Star Wars galaxy to restore the democratic ideals of the Old Republic.
Split into simpler sentences: As a direct reaction to the Galactic Empire, the Alliance insurgency conducted covert operations Imperial garrison-worlds and guerrilla warfare against the Imperial Fleet throughout the Star Wars galaxy. Their objective was to restore the democratic ideals of the Old Republic.