The phrase "a vast complex of" is correct and usable in written English.
It can be used to describe a large and intricate system, structure, or network of related elements.
Example: "The city is home to a vast complex of interconnected parks and recreational areas."
Alternatives: "a large network of" or "an extensive system of".
It shelters Shenzhen's governmental buildings, and a vast complex of indoor and outdoor public spaces.
Since then, a vast complex of buildings has been constructed at the site.
EACH one of us builds his or her own New York, assembling it from a vast complex of choices.
The completed Louvre was a vast complex of buildings forming two main quadrilaterals and enclosing two large courtyards.
From the 1920s until the 1950s Ireland locked up people who did not fit the state's desired image in a vast complex of institutions.
The camp is a kind of Guinean Fort Hood, a vast complex of military housing spread over a hillside on the southern edge of Conakry.
A vast complex, one of the hubs of Prypyat, housing shops, restaurants and the Palace of Culture, is now overgrown with saplings and brush, and strewn with broken glass and rubble.
Two people were stabbed to death on Friday in the Forbidden City, a vast complex in Beijing of vermilion-painted imperial halls and stone courtyards that is now one of the capital's biggest tourist attractions.
Since its creation during a thaw in inter-Korean relations nine years ago, the Kaesong park had grown from a small collection of buildings into a vast complex that became one of the world's most unusual investment enclaves.
They're all here, the whole world!" Cunningham lives alone in the Carnegie Hall Tower, one of the last tenants in a formerly vast complex of artists' studios, without a private bathroom or cooking facilities.
Prisoners were often shuttled to Abu Ghraib — a vast complex twenty miles west of Baghdad, with three miles of cinder-block walls and twenty-four watchtowers — in an ice-cream truck.
