Complex sentence: In December 1914, four months after the outbreak of the First World War, he entered the Royal Military College, Sandhurst and, on 11 May 1915, he was commissioned as a second lieutenant, into the Queen's Own Cameron Highlanders.
Split into simpler sentences: In December 1914, four months after the outbreak of the First World War, he entered the Royal Military College, Sandhurst. On 11 May 1915 he was commissioned as a second lieutenant, into the Queen's Own Cameron Highlanders.