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The phrase "are pretty complex" is correct and usable in written English.
It can be used to describe something that has a high level of difficulty or intricacy.
Example: "The mathematical concepts we are studying this semester are pretty complex, requiring a deep understanding of the fundamentals."
Alternatives: "are quite complicated" or "are fairly intricate".
Dictionary
are pretty complex
adverb
Somewhat, fairly, quite; sometimes also (by meiosis) very.
Exact(11)
"These songs are pretty complex, actually.
Dr. Wood said that although he had read the five papers quickly "late at night over a glass of whisky," he believed they would prove to be "a watershed in our understanding of human evolution, even if only to demonstrate that things are pretty complex, and because of this it will be very difficult to link different fossils in an evolutionary sequence".
"Trying to model and simulate it are pretty complex.
"All of these relationships are pretty complex partnerships," Hardy told me in a phone conversation.
"The actual physics behind atomization are pretty complex," said co-founder Gabriel Parisi-Amon, who previously worked in supply chain management for Apple.
The instructions are pretty complex and you need quite a few parts, including a powerful motor and a go kart wheel.
Similar(47)
The insanity of love was pretty complex, too.
Some of my tics can be pretty complex: "Alexa Chung died.
The guy is pretty complex and difficult and there is a dark side".
"It's pretty complex," said Elyse Fink, a spokeswoman for the buildings department.
"Derivatives can be pretty complex, and 'illiquid', meaning they don't get traded a lot, or at all, so it's harder to determine their value.
More suggestions(18)
are relatively complex
are pretty difficult
are really complex
are pretty intricate
are very complex
are quite complex
are pretty sophisticated
are fairly complex
are pretty convoluted
are pretty good
are pretty constant
are pretty upset
are pretty smart
are pretty great
are pretty mellow
are pretty high
are pretty stark
are pretty independent
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com