Complex sentence: His service saw extensive operations in North West Frontier Province, served well in the "Operation Khodad Khel" in 1921, and further participated in Waziristan war in 1920.
Split into simpler sentences: His service saw extensive operations in North West Frontier Province. He went on to serve in the "Operation Khodad Khel" in 1921, and in the Waziristan war in 1920.