Complex sentence: The high rocky ridge nine km to the south of Mandore was an obvious choice for the new city of Jodhagarh, with the natural, enhanced by a fortress of staggering proportions, and to which Rao Jodha's successors added over the centuries.
Split into simpler sentences: The high rocky ridge nine km to the south of Mandore was an obvious choice for the new city of Jodhagarh. The natural elevation was enhanced by a fortress of staggering proportions, to which Rao Jodha's successors added over the centuries.