Complex sentence: Under the Cole Protocol, Captain Keyes, the "Autumn" s commanding officer, prepares to abandon ship: the protocol mandates the evacuation of any AI constructs, thereby charging the Master Chief with safeguarding Cortana from the Covenant.
Split into simpler sentences: Under the Cole Protocol, Captain Keyes, the "Autumn" s commanding officer, prepares to abandon ship. Since the protocol mandates the evacuation of any AI constructs, the Master Chief is charged with safeguarding Cortana from the Covenant.