Complex sentence: The clitoral hood, like the foreskin, is composed of muccocutaneous tissues; these tissues are between the mucosa and the skin, and they may have immunological importance because they may be a point of entry of mucosal vaccines.
Split into simpler sentences: The clitoral hood, like the foreskin, is composed of muccocutaneous tissues, which are tissues that are between the mucosa and the skin. These tissues may have immunological importance, as they may be a point of entry of mucosal vaccines.