《新唐书·列传·卷一百四十二》
至此，因药罗葛氏世代有功，不敢让自己族人扬名，而尽取可汗的子孙送到朝廷。
至是，以药罗葛氏世有功，不敢自名其族，而尽取可汗子孙内之朝廷。
Since then, because the Yaoluoge family has made great contributions for generations, they dare not let their family members become famous, but send all the descendants of the Khagan to the court.
<s>[INST] Kindly elucidate the central themes in this passage in English: 至是，以药罗葛氏世有功，不敢自名其族，而尽取可汗子孙内之朝廷。 [/INST] Since then, because the Yaoluoge family has made great contributions for generations, they dare not let their family members become famous, but send all the descendants of the Khagan to the court.</s>
Kindly elucidate the central themes in this passage in English: 至是，以药罗葛氏世有功，不敢自名其族，而尽取可汗子孙内之朝廷。
user
Since then, because the Yaoluoge family has made great contributions for generations, they dare not let their family members become famous, but send all the descendants of the Khagan to the court.
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