The phrase "ambitious and complex" is correct and usable in written English.
It can be used to describe a project, idea, or task that is both challenging and intricate in nature.
Example: "The new software development project is ambitious and complex, requiring a skilled team to navigate its many challenges."
Alternatives: "challenging and intricate" or "aspirational and multifaceted".
But Duolingo is far more ambitious and complex.
Like the coyote, he has ambitious and complex plans.
"Throw People" is odder than "Land Flat," less alluring but more ambitious and complex.
The Turner prize judges called it "an ambitious and complex film which rewards repeated viewing".
Yes, there are more ambitious and complex shows than ever before.
Angie admired the ambitious and complex novels of Christina Stead as the very opposite of the "small English novel".
The ambitious scale and complex nature of the construction projects that Brunelleschi undertook certainly must have required him to draw, but none of his drawings survive.
The music was the constant, and the challenges of maintaining ambitious and increasingly complex and diverse programs were easily eclipsed by the rewards.
The most ambitious and structurally complex of Lodge's novels, it is sometimes too brisk and cheerful for its own challenging themes.
"The health reform law is more ambitious and more complex than Part D. It must reach people not yet enrolled in government programs; it relies on more-complex information-technology systems working; it requires the cooperation of state governments, not all of whom are enthusiastic.
Ms. Withers's piece, performed by her Dance Construction Company and the dance company of George Washington University, where Ms. Withers teaches, was far more ambitious and awesomely complex, filling the stage of the Damrosch Park band shell with layer upon layer of huge video images and photographs projected on rocklike sculptures.
