Complex sentence: The Undead are effectively split into two distinct armies: that of the Tomb Kings which has a strong ancient Egyptian feel with mummies and chariots driven by skeletons; and the army of the Vampire Counts which features vampires, zombies and so forth.
Split into simpler sentences: The Undead are effectively split into two distinct armies: that of the Tomb Kings which have a strong ancient Egyptian feel with mummies and chariots driven by skeletons. The army of the Vampire Counts which features vampires, zombies and so forth.