Sentence:  The universe, he &#91;Plato&#93; proposes, is the product of rational, purposive, and beneficent agency. It is the handiwork of a divine Craftsman ("<WSD>Demiurge</WSD>," "dêmiourgos", 28a6), who, imitating an unchanging and eternal model, imposes mathematical order on a preexistent chaos to generate the ordered universe ("kosmos"). 
Meaning of the word marked with <WSD> tags:  The (usually benevolent) being that created the universe out of primal matter.