Complex sentence: At the time there was also a US Army unit operating in the province conducting civic action projects, the 14th AA Platoon, 2nd Civil Affairs Company, which became attached to 1 ACAU after the latter arrived in Nui Dat.
Split into simpler sentences: At the time there was also a US Army unit operating in the province conducting civic action projects. This was the 14th AA Platoon, 2nd Civil Affairs Company, which became attached to 1 ACAU after the latter arrived in Nui Dat.