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The phrase "are really 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 physics are really complex and require extensive study to grasp fully."
Alternatives: "are quite intricate" or "are very complicated."
Exact(19)
"There are really complex questions.
But these are really complex issues".
"Double agent operations are really complex," he said.
"So these issues are really complex, and I often find them misrepresented," Sagar said.
"There are still all sorts of glitches in the program; the algorithms are really complex".
"In life there are really complex, difficult jobs and some are more complicated and difficult than others.
Similar(41)
Their ideology is really complex.
I think it's really complex politics.
She says the plight of some patients was "really complex".
Dark chocolate is really complex, and can be difficult to blend with other forceful ingredients like Scotch.
They discovered these ice volcanoes, but when you looked at the actual data it was really complex.
More suggestions(18)
are really intricate
are actually complex
are genuinely complex
are really problematic
are really tricky
are really challenging
are really complicated
are really very complicated
are serious? complex
are real complex
is truly complex
are truly complex
be truly complex
is actually complex
are very complex
are admittedly complex
are indeed complex
are pretty complex
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