Complex sentence: With the help of Shang, they defeat Shan Yu's men; as Shang prevents Shan Yu from assassinating the Emperor, Mulan lures the Hun leader onto the roof where she engages him in solo combat.
Split into simpler sentences: With the help of Shang, they defeat Shan Yu's men. As Shang prevents Shan Yu from assassinating the Emperor, Mulan lures the Hun leader onto the roof where she engages him in solo combat.