Complex sentence: Flynn had a break-in at his house in which several items, including guitars were stolen; one guitar, the Washburn 333, or "Dimebolt", was given to him by Dimebag Darrell.
Split into simpler sentences: Flynn had a break-in at his house in which several items, including guitars were stolen. One guitar, the Washburn 333, or "Dimebolt", was given to him by Dimebag Darrell.