Complex sentence: While Pinbacker kills Corazon with a scalpel and chases Cassie into the payload ship, Mace attempts to undo Pinbacker's sabotage and is almost successful, managing to restore most systems before being trapped in a coolant reservoir and freezing to death.
Split into simpler sentences: While Pinbacker kills Corazon with a scalpel and chases Cassie into the payload ship, Mace attempts to undo Pinbacker's sabotage. He is almost successful, managing to restore most systems before being trapped in a coolant reservoir and freezing to death.