Complex sentence: Aided by a mysterious being named Infinite, Doctor Eggman has managed to conquer most of the world, employing an army of villains under his command including Shadow the Hedgehog, Metal Sonic, Chaos, and Zavok.
Split into simpler sentences: Aided by a mysterious being named Infinite, Doctor Eggman has managed to conquer most of the world. However, the Doctor now has an army of villains at his command, including Shadow the Hedgehog, Metal Sonic, Chaos, and Zavok.