Complex sentence: The warehouse contained over a million gallons of whisky and rum under one roof which burned out of control for several hours, as off-duty firefighters from Glasgow, and fire brigades from the surrounding areas were called in to assist.
Split into simpler sentences: The warehouse contained over a million gallons of whisky and rum under one roof. This burned out of control for several hours, as off-duty firefighters from Glasgow and fire brigades from the surrounding areas were called in to assist.