Complex sentence: The Florida State Seminoles, which uses the iconography of the Seminole tribe and whose mascots are Osceola and Renegade, a depiction of the Seminole chief Osceola and his Appaloosa horse.
Split into simpler sentences: The Florida State Seminoles use the iconography of the Seminole tribe. Their mascots are Osceola and Renegade, depictions of the Seminole chief Osceola and his Appaloosa horse.