それを実行した

carried it out

→ 其れ
phrase Rare #22,373
carried it out A past-tense phrase meaning that someone carried out, implemented, or put something into practice. それ refers to an action, plan, or task understood from context.
JA: 彼女は計画を立て、それを実行した。
EN: She made a plan and carried it out.

彼は実際にそれを実行した

He actually did it.

彼はそう言ったさらに驚いたことに自分自身でそれを実行した

He said that, but even more surprisingly, he carried it out himself.

私は計画を立てただけでなくそれを実行した

I not only made a plan but also carried it out.