Zeratul is a dark templar, a renowned psionic warrior and assassin whose forbears were exiled from the protoss homeworld of Aiur over a thousand years ago.

【人物关系】

Zeratul是templar，也是warrior 和 assassin。

whose（他的）指“warrior 和 assassin的”。

也就是说，whose forbears = Zeratul’s forbears

whose forbears were exiled 意思是：Zeratul的祖先被别人流放。