Complex sentence: Books written by defenders of the Arbenz government, which were strongly critical of the US intervention, had generally been better received, and nationalist Latin Americans were inclined to view the Castillo Armas government as something created by the US.
Split into simpler sentences: Books written by defenders of the Arbenz government, which were strongly critical of the US intervention, were generally better received. Nationalist Latin Americans were inclined to view the Castillo Armas government as a creation of the US.