katham etad abhāvayan

ye-those; marici-adayah-great sages headed by Marici; viprah-brahmanas; yah-who; tu-indeed; svayambhuvah manuh-and Svayambhuva Manu; te-they; vai-indeed; brahmanah-of Lord Brahma; adesat-by the order; katham-how; etat-this universe; abhavayan-evolved.