Complex sentence: Still, the war did not create an Human Factors Engineering (HFE) discipline as such, the reasons attributed to this are the facts that technology was not very advanced at the time and Americas involvement in the war lasted only for 18 months.
Split into simpler sentences: Still, the war did not create a Human Factors Engineering (HFE) discipline, as such. The reasons attributed to this are that technology was not very advanced at the time and America's involvement in the war only lasting for 18 months.