Complex sentence: Clift taught psychology of religion at the University of Denver from 1969 to 1992, and in 1981 helped start its joint Ph.D. program in Religious and Theological Studies with the Iliff School of Theology.
Split into simpler sentences: Clift taught psychology of religion at the University of Denver from 1969 to 1992. In 1981, he helped start its joint Ph.D. program in Religious and Theological Studies with the Iliff School of Theology.