Complex sentence: This concept was hereafter changed, so that frontal assaults would be staged only after all reinforcements had arrived and careful offensive preparations hadbeen completed.the total combined power of both Army and Navy elements would thereby be exploited fully.
Split into simpler sentences: This concept was changed, so that frontal assaults would be staged only after all reinforcements had arrived and careful offensive preparations had been completed. The combined power of both Army and Navy elements would thereby be exploited fully.