Complex sentence: Many British and Canadian commanders had fought as junior officers Western Front in the First World War and believed that an operational approach based on technology and firepower could be used to avoid another long drawn-out bloodbath.
Split into simpler sentences: Many British and Canadian commanders had fought as junior officers on the Western Front in the First World War. They believed that an operational approach based on technology and firepower could be used to avoid another long drawn-out bloodbath.