Complex sentence: That same year, Thompson was injured during a fall from a horse, and in his absence, on October 5th, Coe was involved in a shootout with town Marshal "Wild" Bill Hickok, in which Coe was killed.
Split into simpler sentences: That same year, Thompson was injured during a fall from a horse. In his absence, on October 5, Coe was involved in a shootout with town marshal "Wild" Bill Hickok, in which Coe was killed.