Complex sentence: Early Chinese sources identify this people with the ethnonym Seyanto, quoting them as one of the most powerful tribes among the descendants of the Xiongnu; actually they emerged from the year 635 as part of the "Üç-Oğuz" confederation of Oghuz Turks.
Split into simpler sentences: Early Chinese sources identify this people with the ethnonym Seyanto, quoting them as one of the most powerful tribes among the descendants of the Xiongnu. Actually they emerged as part of the "Üç-Oğuz" confederation of Oghuz Turks.