Complex sentence: The space between the tower and the water's edge consisted of a fortified enclosure, at the bottom of which stood a battery commanding the straits; in total, the Randa fortifications had been armed with more than 30 guns.
Split into simpler sentences: The space between the tower and the water's edge consisted of a fortified enclosure, at the bottom of which stood a battery commanding the straits. In total, the Randa fortifications had been armed with more than 30 guns.