Complex sentence: A cadet corps of boys aged 12 to 15, later to be one of the inspirations for the Scouting movement, was also formed to act as messengers and orderlies, so releasing men to fight and bringing the total engaged in the military effort to around 2000.
Split into simpler sentences: A cadet corps of boys aged 12 to 15, later to be one of the inspirations for the scouting movement, was also formed to act as messengers and orderlies. The recruitment of these child soldiers released men to fight, bringing the total engaged in the military effort to around 2000.