The phrase "a complex and ambitious" is correct and usable in written English.
It can be used to describe something that has multiple layers or intricacies and is also characterized by a strong desire to achieve something great or challenging.
Example: "The project was a complex and ambitious undertaking that required extensive planning and collaboration."
Alternatives: "a multifaceted and bold" or "a sophisticated and daring".
Contractors complained that the agency did not have the expertise to lead such a complex and ambitious undertaking, requiring the integration of dozens of programs and databases.
People came out from London to see the shows they were doing, and Serota, whose success in developing such a complex and ambitious program had more or less done away with his reticence, started to be talked about in the London art world.
From that initial idea grew a complex and ambitious literary thriller that took her four years to plot and research – and that was just the first part, since The Serpent Papers is book one of a planned trilogy following her heroine, Anna Verco, a young academic and expert in rare books, on the trail of a lost manuscript and the truth about her own history.
The heterogeneity of NoSQL systems as well as of their query languages make the definition of a general FGAC enforcement solution a complex and ambitious task.
N. Douglas Lees recalls a midcareer colleague, a behavioral ecologist, who was pursuing a complex and ambitious research agenda in the face of tremendous competition.
'"Argo' practically bursts at the seams, but each great character actor has their place, serving a complex and ambitious narrative that expertly juggles political intrigue, tense emotional stakes and Hollywood glitter, resulting in an absorbing and engrossing picture".
W. Ford Doolittle, Dalhousie University This is a complex, challenging and ambitious paper.
And Brighton-based developer The Chinese Room has taken a highly complex and ambitious approach to its audio.
"Paisan," a more complex and ambitious film, tells the story of the Allied campaign in Italy through six separate episodes, beginning in the south with the landings in Sicily and ending with a last-ditch conflict between German troops and Italian partisans, aided by American O.S.S. agents, in the swampy delta of the northern Po River.
However, UNICEF support is presently engaged in a transition process from a pioneering role in the aftermath of an acute emergency situation to an equally challenging role of contributor to an increasingly complex and ambitious development process.
The Covent Garden Ring Cycle first produced in 2004 still irritates purists for its apparently random associations, while at the New York Metropolitan Opera the innovative production by Robert Lepage was condemned by reviewers for a set so complex and ambitious that it drained meaning from the operas.
