Complex sentence: He deputized Holliday, Warren Earp, Sherman McMaster, and "Turkey Creek" Jack Johnson, and they guarded Virgil Earp and his wife Allie on their way to the train for California.
Split into simpler sentences: He deputized Holliday, Warren Earp, Sherman McMaster, and "Turkey Creek" Jack Johnson. The Earp party guarded Virgil Earp and his wife Allie on their way to the train for California.