These two clauses mean basically the same thing. "Portion" and "plunder" refer to what a king rewards his army with after a battle. This means God will greatly honor his servant because of his sacrifice. (See: [[rc://en/ta/man/jit/figs-parallelism]] and [[rc://en/ta/man/jit/figs-metaphor]])
"Exposed" means to be vulnerable or unprotected. The servant of Yahweh put himself in a situation where he would die. Alternate translation: "he willingly accepted the possibility of death" (See: [[rc://en/ta/man/jit/figs-metonymy]])