Complex sentence: Smith is known in Catholic circles as an expert on Humanae Vitae and on Pope John Paul II's teaching on marriage and family life ("Theology of the Body") and is a popular public speaker about Catholic teaching on sexuality and on bioethics.
Split into simpler sentences: Smith is known in Catholic circles as an expert on "Humanae Vitae" and on Pope John Paul II's teaching on marriage and family life ("Theology of the Body"). She is a popular public speaker about Catholic teaching on sexuality and on bioethics.