Complex sentence: Though the cause of the blaze is still unknown, tradition states it was caused by students'playing with matches' in a dormitory.Due to frozen fire hydrants, the blaze could not be put out and the buildings burned to the ground.
Split into simpler sentences: Though the cause of the blaze is still unknown, tradition states it was caused by students'playing with matches' in a dormitory. Because the fire hydrants were frozen, the blaze could not be put out and the buildings burned to the ground.