Complex sentence: Her first book, "The Epigenetics Revolution," describes how epigenetic modifications allow the same DNA to express different characteristics, such as both a caterpillar and a butterfly; she likens DNA to a script for a play rather than a template.
Split into simpler sentences: Her first book, "The Epigenetics Revolution," describes how epigenetic modifications allow the same DNA to express different characteristics, such as both a caterpillar and a butterfly. She likens DNA to a script for a play rather than a template.