Complex sentence: In March of that year, Hutier again employed the infiltration tactics in the Spring Offensive and hammered the Allied line along the gap between the French and British armies, advancing some 40 miles along the Somme River toward Amiens.
Split into simpler sentences: In March of that year, Hutier again employed the infiltration tactics in the Spring Offensive. He hammered the Allied line along the gap between the French and British armies, advancing some 40 miles along the Somme River toward Amiens.