Complex sentence: The Great War was now convulsing Europe, and Hart-Synnot was deployed to France on New Year's Day 1917, serving again as a GSO2 with the 17th and 40th Divisions.
Split into simpler sentences: The Great War was now convulsing Europe, and Hart-Synnot was deployed to France on New Year's Day 1917. He again served as a GSO2 with the 17th and 40th Divisions.