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The phrase "are combinations of" is correct and commonly used in written English.
It is used to describe a grouping or pairing of elements. Example: The colors of the rainbow are combinations of red, orange, yellow, green, blue, indigo, and violet.
Exact(59)
Some organic compounds are combinations of carbon and hydrogen.
Contracts: These contracts are combinations of H.M.O. and P.P.O.
"There are combinations of aircraft that could do parts of it.
Some, even more confusingly, are "combinations of oral testimony and written source".
Data centers are combinations of powerful communication gear like servers, routers and storage units.
The causes of drought are combinations of lowered precipitation and higher temperatures.
People are more comfortable if there are combinations of old and new, serious and funky".
All other cycles in eclipses are combinations of the saros and the inex.
Some of the most interesting are combinations of letters drawn to resemble animals.
Glycoconjugates are combinations of sugar moieties with organic compounds.
Similar(1)
Meals have been combinations of tomatoes, okra, potatoes and onions.
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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