Ye in time past (humeis pote). Ye Gentiles (Rom 1:18-32).
Were disobedient (epeithēsate). First aorist active indicative of apeitheō, to disbelieve and then to disobey. “Ye once upon a time disobeyed God.”
By their disobedience (tēi toutōn apeithiāi). Instrumental case, “by the disobedience of these” (Jews). Note “now” (nun) three times in this sentence.