Complex sentence: The Library stood adjacent to the City Fire Station at the time and although around 15 fire engines and 150 firefighters attended the fire, a priceless collection of books, manuscripts and archive material was destroyed.
Split into simpler sentences: The Library stood adjacent to the City Fire Station at the time. Although around 15 fire engines and 150 firefighters attended the fire, a priceless collection of books, manuscripts and archive material was destroyed.