Complex sentence: During a stop in St. Louis while en route back to Creston from Chicago in 1903, Phillips encountered C. B. Larabee, an old friend from Iowa, who was serving as a Methodist missionary to the Osage Indians west of Bartlesville in Indian Territory.
Split into simpler sentences: During a stop in St. Louis while en route back to Creston from Chicago in 1903, Phillips encountered C. B. Larabee, an old friend from Iowa. He was serving as a Methodist missionary to the Osage Indians west of Bartlesville in Indian Territory.