Complex sentence: Through unknown means he was able to assume a new identity, going by the name Nao'nak, and he became the First Prime of Bynarr, the System Lord of Ne'tu.
Split into simpler sentences: Through unknown means however he was able to assume a new identity in which he was called Nao'nak. In this position he became the First Prime of Bynarr, the System Lord of Ne'tu.