Complex sentence: Quan Chi brokers a deal with Shang Tsung for his assistance in reviving Onaga's army in exchange for a supply of souls that would preserve Shang Tsung's youth, then eliminate evil Outworld emperor Shao Kahn and the perennial Mortal Kombat champion Liu Kang.
Split into simpler sentences: Quan Chi brokers a deal with Shang Tsung for his assistance in reviving Onaga's army in exchange for a supply of souls that would preserve Shang Tsung's youth. Before they act on this, they first eliminate evil Outworld emperor Shao Kahn, and then the perennial Mortal Kombat champion Liu Kang.