Complex sentence: The German withdrawal forestalled the attacks of the British and ("GAN") but also freed French divisions and by late March GAN had been reduced by eleven infantry, two cavalry divisions and guns, which went into the French strategic reserve.
Split into simpler sentences: The German withdrawal forestalled the attacks of the British and (GAN) but also freed French divisions. By late March GAN had been reduced by eleven infantry, two cavalry divisions and guns, which went into the French strategic reserve.