Complex sentence: In June 1995, a disastrous fire broke out on the roof of main building during necessary reconstruction and refurbishment, and because neither ladders nor high pressure pumps could reach the fire, the roof and the upper floors were destroyed.
Split into simpler sentences: In June 1995, a disastrous fire broke out on the roof of the main building during necessary reconstruction and refurbishment. As neither ladders nor high pressure pumps could reach the fire, the roof and the upper floors were destroyed.