Complex sentence: Each of these rebuilt Mustangs is given a Vehicle Identification Number (VIN) made up by Unique Performance the CSE serial numbers did not come from any higher authority and bear no relation to Shelby-produced vehicles.
Split into simpler sentences: Each of these rebuilt Mustangs was given a Vehicle Identification Number (VIN) made up by Unique Performance. The "CSE" serial numbers did not come from any higher authority and bear no relation to Shelby-produced vehicles.