の苦しみを

…'s suffering

→ の
phrase Rare #45,443
…'s suffering A phrase fragment meaning that someone or something is the object of an action involving suffering. The full meaning depends on the verb that follows.
JA: 彼の苦しみを理解したい。
EN: I want to understand his suffering.

マハは彼の苦しみを取り除くためフクロウたちを送った。

Maha sent the owls to relieve his suffering.

— ソング・オブ・ザ・シー 海のうた (2014)

難民達の苦しみを救済すべきだ。

We should alleviate the suffering of refugees.