Complex sentence: Douglas served in the Second Anglo-Afghan War between 1878 and 1880 and the First Boer War between 1880 and 1881 and was promoted to major on 1 March 1881.
Split into simpler sentences: Douglas served in the Second Anglo-Afghan War between 1878 and 1880. He served in the First Boer War between 1880 and 1881 and was promoted to major on 1 March 1881.