Complex sentence: The historical Osceola, a war leader, did not actually live long enough to attain the rank of Seminole "chief", for example, and historians debate how much inclination or opportunity he had to ride horses in wartime.
Split into simpler sentences: The historical Osceola, a war leader, did not actually live long enough to attain the rank of Seminole "chief". Historians debate how much inclination or opportunity Osceola had to ride horses in wartime.