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Discover LudwigSuggestions(5)
The phrase "are very complex and" is correct and usable in written English.
It can be used when describing something that has multiple intricate components or aspects, often followed by additional information or examples.
Example: "The theories of quantum mechanics are very complex and require a deep understanding of advanced mathematics."
Alternatives: "are quite intricate and" or "are highly complicated and".
Exact(60)
"These are very complex and potentially contentious negotiations".
Business processes in hospitals are very complex and variable.
This is because the OECD's [rules] are very complex and very difficult to enforce".
"The legal documents are very complex and difficult to explain," he said.
Water problems are very complex and come in a multitude of flavors.
H.E.V. drive systems are very complex and vary greatly from vehicle to vehicle.
Corporations are very complex, and there's a lot of different people, who have different feelings.
The reasons why HD causes motor symptoms are very complex and not entirely clear.
Many purification rites are very complex and incorporate several different types of purifying actions.
Biological organisms are very complex, and their many parts interact in numerous ways.
Financial time series are very complex and dynamic as they are characterized by extreme volatility.
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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