Complex sentence: The Ammunition Identification Code (AIC) was a sub-set of the Standard Nomenclature List (SNL) used by the US Army's Ordnance Corps from early 1942 to 1958.
Split into simpler sentences: The Ammunition Identification Code (AIC) was a sub-set of the Standard Nomenclature List (SNL). The AIC was used by the US Army's Ordnance Corps from early 1942 to 1958.