Complex sentence: The Essex Regiment was a line infantry regiment of the British Army in existence from 1881 to 1958, and served in many conflicts such as the Second Boer War and both World War I and World War II, serving with distinction in all three.
Split into simpler sentences: The Essex Regiment was a line infantry regiment of the British Army in existence from 1881 to 1958. The regiment served in many conflicts such as the Second Boer War and both World War I and World War II, serving with distinction in all three.