簡単に言えば

simply put

→ 簡単だ
phrase Rare #29,397
simply put Used to summarize or explain something in a simpler, more concise way. Also commonly heard as 簡単に言うと. The form 簡単に言うな means “don't say it so simply” or “don't make it sound so simple,” and is a different use.
JA: 簡単に言えば、彼は約束を守らなかった。
EN: Simply put, he didn't keep his promise.

簡単に言えば

Simply put,

— ベイビー・ブローカー (2022)

簡単に言えば私は賛成しません

Simply put, I disagree.

簡単に言えばこういうことだ

Simply put, that's what it means.