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Discover Ludwig"were twofold" is correct and usable in written English.
You can use it when you want to describe two aspects of something. For example: "The reasons for her resignation were twofold; she wanted to pursue a different career path, and also to move closer to family."
Dictionary
were twofold
adjective
Double; duplicate; multiplied by two.
Exact(59)
My motives were twofold.
Their religious functions were twofold.
The effects of that withdrawal were twofold.
The eye-catching bits of the Times article were twofold.
The reason for the extremely long odds were twofold.
His influences were twofold and both involved his father.
The judge's concerns were twofold, lawyers said later outside the courtroom.
The reasons were twofold, said Dr. Barbara Finck, the company's medical director.
On this score, his troubles were twofold: his height (small), plus their fondness for ELO.
He says the issues he faced as a man dating in Silicon Valley were twofold.
At a news conference after the ceremony, General McColl said the risks of the mission were twofold.
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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