Complex sentence: And those were Red Rock's final two rides in his PRCA rodeo career, retiring unridden after 309 attempts in professional rodeos, bucking first with Mert Hunking and then in the PRCA.
Split into simpler sentences: And those were Red Rock's final two rides in his rodeo career. He retired unridden after 309 attempts in professional rodeos, bucking first with Mert Hunking and then in the PRCA.