arthasiddhis tu tat-sutaḥ

visve-devah-the demigods named the Visvadevas; tu-but; visvayah-from Visva; aprajan-without sons; tan-them; pracaksate-it is said; sadhyah-ganah-the demigods named the Sadhyas; ca-and; sadhyayah-from the womb of Sadhya; arthasiddhih-Arthasiddhi; tu-but; tat-sutah-the son of the Sadhyas.