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Discover Ludwig"are supplemented" is correct and usable in written English.
You can use it when you want to indicate that something is being added to something else. For example, "The textbooks we have in class are supplemented with online activities."
Dictionary
are supplemented
noun
Something added, especially to make up for a deficiency.
Exact(56)
These trends are supplemented by local investment.
These are supplemented by open-air "long drop" toilets.
Today, the trees are supplemented by cuttings that are cryogenically preserved at 300 degrees below zero.
They are supplemented with important loans from museums and private collections.
Their purpose was transport, and they are supplemented by films of masquerades in action.
These are supplemented by a very large number of interviews conducted specifically for the book.
These donations are supplemented by foundation grants, corporate underwriting and a dwindling amount of government support.
The declining funds direct from central government are supplemented by lottery funding (almost £70m).
After the number has been called, they are supplemented by other information if Headquarters has any.
These manifestations of humanity are supplemented with evidence that Stalin had intellectual aspirations.
Their online reports are supplemented by Dr. Gupta and Elizabeth Cohen, the network's senior medical correspondent.
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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