येन by whom, सागर: ocean, खानित: was made to be dug, यान्तम् while he was marching (to the battle), यम् whom, षष्टि: पुत्रसहस्राणि sixty thousand sons, पर्यवारयन् surrounded by, स: that, सगरो नाम king named Sagara, येषाम् amongst those.
Among them a king named Sagara got the ocean dug and his sixty thousand sons surrounded him whenever he went (to battle).