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The phrase "complex and challenging" is correct and usable in written English.
You can use it to describe a situation, task, or problem that is difficult and requires significant thought or effort to understand or solve.
Example: "The project we are undertaking is both complex and challenging, requiring a diverse set of skills and expertise."
Alternatives: "difficult and demanding" or "intricate and tough."
Exact(60)
It was a complex and challenging situation.
This is both complex and challenging.
Nuclei are complex and challenging quantum objects.
It describes the work as complex and challenging.
Most large computerization projects are complex and challenging.
Sure, much modern music is complex and challenging.
Effective corporate governance is more complex and challenging than ever.
We live in turbulent, complex, and challenging times.
This can be a complex and challenging task.
It's a subtle, complex and challenging film, and Roth is excellent.
It pretty much goes without saying that the pieces are complex and challenging.
More suggestions(23)
complex and challenging combination
complex and challenging film
highly complex and challenging
complex and difficult
sophisticated and challenging
intricate and challenging
complex and challenge
multifaceted and challenging
difficult and challenging
complex and mysterious
complex and unique
complex and suggestive
complex and rich
complex and intriguing
complex and dangerous
complex and wrong
complex and sprawling
complex and terrifying
complex and conceptual
complex and surreal
complex and voluptuous
complex and subtle
complex and unsettling
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com