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The phrase "are very complex" is correct and usable in written English.
You can use it to describe something that has many intricate parts or is difficult to understand.
Example: "The theories of quantum mechanics are very complex and require a deep understanding of physics."
Alternatives: "are quite intricate" or "are highly complicated."
Exact(60)
They are very complex".
"These are very complex decisions.
"Unfortunately, things are very complex".
These things are very complex......
However, cross-strait relations are very complex.
People are very complex, variable and unpredictable.
"The methods and motives are very complex.
Our verbal forms are very complex".
These deportation proceedings are very complex.
"Often those are very complex decisions.
"Ecological systems are very complex this way," Dr. Hastings said.
More suggestions(18)
are very sophisticated
are very intricate
are very difficult
are particularly complex
contain very complex
are incredibly complex
are highly complex
are extraordinarily complex
are exceptionally complex
are pretty complex
present very complex
are very poor
are very mature
are very expressive
are very lucky
are very specialized
are very reasonable
are very competitive
Write better and faster with AI suggestions while staying true to your unique style.
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