Complex sentence: Brennan notes another call to Tony Luna's restaurant, where the officers found the mutilated owner hanging from a meat hook in the kitchen; and a used car lot run by Tony Luna, that had just been firebombed and the owner burned alive.
Split into simpler sentences: Brennan notes another call to Luna's restaurant, where the officers found the mutilated owner hanging from a meat hook. A car lot run by Tony Luna is firebombed and the owner burned alive.