Complex sentence: Allegro went on to write several other books exploring the roots of religion; notably "The Dead Sea Scrolls and the Christian Myth", which relates Christian theology to Gnostic writings, classical mythology and Egyptian sun-worship in the common quest for divine light.
Split into simpler sentences: Allegro went on to write several other books exploring the roots of religion. These included "The Dead Sea Scrolls and the Christian Myth", which relates Christian theology to Gnostic writings, classical mythology and Egyptian sun-worship in the common quest for divine light.