Complex sentence: These people also were not treated as human as the enslaved were naked and shackled together with several different types of chains; they lived like animals throughout their long voyage to the New World.
Split into simpler sentences: These people also were not treated as human as the enslaved were naked and shackled together with several different types of chains. Not only were they treated in an inhumane fashion, they lived like animals throughout their long voyage to the New World.