Complex sentence: The space between the stone fortification wall and the ditch quickly filled with wooden sheds and wattle and daub houses, as the city quickly outgrew its initial fortification, and by 1200 it had quadrupled in surface.
Split into simpler sentences: The space between the stone Wall and the ditch would have filled with wooden sheds and wattle and daub houses. The city developed quickly outside its initial fortification, and by 1200 it had quadrupled in surface.