Complex sentence: The "Wangar" denomination seems to reflect the Slavic form of the ethnonym of the Onogurs, another people of Turkic origin, thus this charter may well attest that they were also present in the territory.
Split into simpler sentences: The "Wangar" denomination seems to reflect the Slavic form of the ethnonym of the Onogurs, another people of Turkic origin. Thus this charter may well attest that they were present in the territory.