Complex sentence: During his tour, Lockwood devised tactics to make the most effective use of submarines and pushed the Navy's Bureau of Ships and Bureau of Ordnance to provide his men with the most effective submarines and torpedoes possible.
Split into simpler sentences: During his tour, Lockwood devised tactics to make the most effective use of submarines. He pushed the Navy's Bureau of Ships and Bureau of Ordnance to provide his men with the most effective submarines and torpedoes possible.