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Discover LudwigSuggestions(5)
The phrase "are much more complex" is correct and usable in written English.
It can be used when comparing the complexity of two or more subjects, indicating that one is significantly more intricate than the other.
Example: "The algorithms used in modern AI systems are much more complex than those from a decade ago."
Alternatives: "are significantly more intricate" or "are considerably more complicated."
Exact(60)
They are much more complex.
But some cases are much more complex.
People are much more complex.
Americans are much more complex.
"The injuries are much more complex.
In reality, things are much more complex.
These are much more complex things [now].
Yet we are much more complex than such lowly critters.
Military operations are much more complex than civilian ones.
The world, and we, are much more complex than that.
Things are much more complex now than they were then".
More suggestions(18)
are much more tricky
are much more intricate
are much more sophisticated
are further more complex
are much more cumbersome
are far more complex
are considerably more complex
are much more difficult
are much more diverse
are significantly more complex
are much more intractable
suggest much more complex
are much more complicate
are much more challenging
are much more willing
are much more precise
are much more prone
are much more valuable
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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