Complex sentence: He teams up with Kelso, a kickboxer who had his hands smashed by Kincaid, and together they must fight to exact revenge on the criminal empire that holds their city in an iron grasp.
Split into simpler sentences: He teams up with Kelso, a kickboxer who had his hands smashed by Kincaid, and together, they seek revenge. Together they must fight to take revenge on the criminal empire that holds their city in an iron grasp.