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Discover Ludwig"were developed" is grammatically correct and can be used in written English.
It is the past tense passive form of the verb "develop." Example: "The new drug was developed by a team of researchers."
Dictionary
Exact(60)
New systems were developed.
— when they were developed.
Two basic views were developed.
Specific consent procedures were developed.
Others were developed for housing.
Subsequently, other methods were developed.
Distinctive scripts were developed in particular regions.
All were developed in the Rangers' system.
Similar structures in other materials were developed.
After World War II, industries were developed.
New systems for flying were developed.
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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