Complex sentence: On 9 February 1930 part of the 4th Regiment of Tonkinese Rifles stationed at Yen Bai mutinied against their French officers but were suppressed by loyal troops from the same unit.
Split into simpler sentences: On 9 February 1930, part of the 4th Regiment of Tonkinese Rifles stationed at mutinied against their French officers in the Yen Bai mutiny. They were suppressed by loyal troops from the same unit.