Complex sentence: The text is divided into four books, which provide detailed spiritual instructions: "Helpful Counsels of the Spiritual Life", "Directives for the Interior Life", "On Interior Consolation" and "On the Blessed Sacrament".
Split into simpler sentences: The text is divided into four books, which provide detailed spiritual instructions. The four books are, "Helpful Counsels of the Spiritual Life", "Directives for the Interior Life", "On Interior Consolation", "On the Blessed Sacrament".