彼らの努力は

their efforts

→ 彼等
phrase Rare #39,063
their efforts 彼らの means “their,” 努力 means “efforts,” and は marks the topic. This phrase usually continues with a description of what their efforts were like or accomplished.
JA: 彼らの努力は無駄ではなかった。
EN: Their efforts were not in vain.

彼らの努力は状況をある程度よりよくした

Their efforts improved the situation to some extent.

彼らの努力は無駄ではなかった

Their efforts were not in vain.

彼らの努力はみんな無駄だった

All their efforts were in vain.