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The phrase "are fairly complex" is correct and usable in written English.
You can use it to describe something that has multiple components or is not straightforward, often in academic or analytical contexts.
Example: "The theories of quantum mechanics are fairly complex, requiring a deep understanding of both physics and mathematics."
Alternatives: "are quite intricate" or "are relatively complicated."
Exact(16)
This is because many central processing units (CPU) instructions are fairly complex, taking many clock cycles to perform.
The variability of the F2-layer even during magnetically quiet times are fairly complex owing to the effects of plasma transport.
The devices are fairly complex and the datasheet was not written for people who had never used Xbees before, only as a reference for those familiar with the devices.
The casting was made all the more difficult by the fact that Jake is silent to the other characters but not to viewers: his thoughts are heard in voice-over, and are fairly complex for a 10-year-old.
To meet the versatile requirements posed by brake system manufacturers and railway operators, formulation of contemporary organic composite friction materials are fairly complex containing in some cases even more than a dozen different ingredients.
Many methodologies have been developed for making of EIEs, some of them are fairly complex and unsuitable for EMS implementation in an organizational context, principally when small and medium size enterprises (SMEs) are involved.
Similar(44)
The calculation of this new tax is fairly complex.
Those were fairly complex melodies written on French metres.
The formula that Sather's escape clause is based upon is fairly complex.
The hardware design for our project was fairly complex to set up.
Adding code generation support for an actor is fairly complex, but follows a pattern.
More suggestions(17)
are equally complex
are fairly tricky
are fairly intricate
are fairly sophisticated
are reasonably complex
are very complex
are comparatively complex
are moderately complex
be relatively complex
are pretty complex
are quite complex
are rather complex
were relatively complex
were rather complex
are rather complicated
are somewhat complex
are relatively complex
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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