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Discover LudwigThe phrase "had split up" is correct and usable in written English.
You can use it when indicating that two people or groups were once together but have now separated. For example: "The couple had split up six months ago, but they remained friends."
Exact(57)
They had split up.
(He had split up with Margot Callas in 1964).
"Within months, they had split up," he said.
When he was twelve, his parents had split up.
My parents had split up because of it.
Miller had split up with her boyfriend not long before.
TMZ reported that Ms White had killed herself, apparently days after they had split up again.
It was his theory that the panthers, solitary by nature, had split up and headed north.
We had split up the week before; there was nothing to say.
JT has a blast of his mates bird when they had split up.
Similar(1)
The pair reportedly had an on-again, off-again relationship and had split-up the week before.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com