Complex sentence: He became Commanding Officer (CO) of the 1st Battalion, West Yorkshire Regiment in 1930, and transferred to the Sudan Defence Force in 1933, initially as a General Staff Officer and then from 1935 as Commandant.
Split into simpler sentences: He became Commanding Officer of the 1st Battalion, West Yorkshire Regiment in 1930. He transferred to the Sudan Defence Force in 1933, initially as a General Staff Officer and then from 1935 as Commandant.