Complex sentence: The Fayetteville Arsenal in North Carolina was built in 1838 because during the War of 1812it was realized by the United States Government that the existing distribution of weapons and ammunition making factories was not adequate for the defense of the country.
Split into simpler sentences: The Fayetteville Arsenal in North Carolina was built in 1838 directly as a result of the War of 1812. It was realized by the United States Government that the existing distribution of weapons and ammunition making factories was not adequate for the defense of the country.