その夫婦は

that couple

→ 其の
phrase Rare #34,075
that couple その means “that,” 夫婦 means “married couple,” and は marks the phrase as the topic of the sentence.
JA: その夫婦は毎朝一緒に散歩をします。
EN: That couple takes a walk together every morning.

その夫婦は喧嘩をしたが、すぐに仲直りをした

The couple had a fight, but they made up soon afterward.

その夫婦は最初の子供にマーク名前をつけた

The couple named their first child Mark.

その夫婦は自分たち二人の問題を解決しようとしたがだめだった

The couple tried to resolve their problems on their own, but they couldn’t.

その夫婦は幸福な生活を送った

The couple lived a happy life.

その夫婦は死ぬまで幸福暮らした

The couple lived happily ever after.