Complex sentence: Brinn, Covenant's "Haruchai" bodyguard, sacrifices himself in a duel with the Tree's Guardian "ak-Haru Kenaustin Ardenol", and is then regenerated as the new Guardian and leads the party to the Tree itself.
Split into simpler sentences: Brinn, Covenant's "Haruchai" bodyguard, sacrifices himself in a duel with the Tree's Guardian "ak-Haru Kenaustin Ardenol". He is regenerated as the new Guardian and leads the party to the Tree itself.