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残ったのは

what remained was

→ 残る
phrase Rare #32,649
what remained was Used to introduce or emphasize what was left or remained. 残ったのは refers to something that has already remained, while 残るのは refers to what will remain or what remains in general.
JA: 残ったのは、古い写真だけだった。
EN: The only thing that remained was an old photograph.

残ったのはオレとお前とお前の女他に理由があるか？

The only ones left are me, you, and your woman. Is there any other reason?

— ドライヴ (2011)

皮肉にも残ったのは紙の記録だけ

Ironically, all that remained was the paper record.

— ブレードランナー 2049 (2017)

残ったのは我々だけだ。

We’re the only ones left.

— アトランティス 失われた帝国 (2001)