Complex sentence: The state of Bikaner had a long tradition of using camel soldiers going back to 1465 when Rao Bika had led a force of 300 sowar (or camel riders) to conquer neighbouring territories.
Split into simpler sentences: The state of Bikaner had a long tradition of using soldiers mounted on camels. For instance, in 1465 Rao Bika led a force of 300 sowar (or camel riders) to conquer neighbouring territories.