Complex sentence: A hood to hide or control the wearer often covers the whole head, with the result that the wearer can see little or nothing, like a blindfold, or it can be to prevent identification of the wearer.
Split into simpler sentences: A hood to hide or control the wearer often covers the whole head, with the result that the wearer can see little or nothing, like a blindfold. Or it can be to prevent identification of the wearer.