The phrase "are wonderfully complex and" is correct and usable in written English.
It can be used to describe something that has intricate and fascinating qualities, often in a positive context.
Example: "The ecosystems in the rainforest are wonderfully complex and support a diverse range of species."
Alternatives: "are intricately detailed and" or "are beautifully intricate and".
One of the great cryptic short story writers is Rudyard Kipling, something of an unacknowledged genius of "suppressed narration", as it is sometimes known: stories like "Mary Postgate" or "Mrs Bathurst" are wonderfully complex and multilayered.
In the end, we humans are wonderfully complex, and the more we learn about ourselves on every level, the more tools we will eventually be able to develop to improve our personal and communal lives.
As a game, Sons of Liberty is wonderfully complex and detailed.
It was wonderfully complex, rich and delicious, with a tremendously long finish.
The ecological world is wonderfully complex, the threats are diverse, and the set of solutions should be appropriately robust.
"Their grand reserve is beautiful, with the taste of caramel and apples, citrus and a little bit of vanilla, as good as a reserve should be, and the blanc de noirs is wonderfully complex".
Wine can be wonderfully complex, but for all the chitchat about clones, soil types and vintage variation, only one thing really matters.
Odious trolls prove to be quite charming real life; nice-guy comedians turn out to be dicks; daytime TV presenters turn out to be wonderfully complex.
Even in a role that sees her on the big screen for about 15 minutes total of a two hour film, she's wonderfully complex.
His characters are wonderfully human: complex and ambiguous, fearful and determined, but people, who, when need be, can gather their courage and do what needs to be done.
Johnny Byron is a wonderfully complex and difficult character in an excitingly nuanced piece of live theatre about, among other things, outsiders, conformity, freedom, youth, sex, magic and, above all, England.
