Complex sentence: Carmichael-Anstruther was educated at Eton, and served as an officer in the Coldstream Guards, and in 1831, became a major of the Lanark Militia.
Split into simpler sentences: Carmichael-Anstruther was educated at Eton College, and served as an officer in the Coldstream Guards. In 1831 he became a major of the Lanark Militia.