Complex sentence: At the end of the war Hinckley's contributions totaled nearly 40% of all war boats built in Maine, for which the company was awarded two Army-Navy "E's" for excellence in 1942 and 1943.
Split into simpler sentences: At the end of the war Hinckley's contributions totaled nearly 40% of all war boats built in Maine. For this outstanding effort Hinckley was awarded two Army-Navy "E's" for excellence in 1942 and 1943.