Complex sentence: The fire was fueled by a natural gas leak at the hotel, which caused an explosion that blew out the windows of the hotel and shattered glass as far as nine blocks away.
Split into simpler sentences: The fire was fueled by a natural gas leak at the hotel. The gas leak caused a major blast which blew out the windows of the hotel, with the sheer force of the blast shattering glass out as far as nine blocks away.