The phrase "a complex collection of" is correct and usable in written English.
It can be used to describe a group of items, ideas, or elements that are intricate or multifaceted in nature.
Example: "The museum features a complex collection of artifacts from various ancient civilizations."
Alternatives: "a diverse array of" or "an intricate assortment of".
Coffee is a complex collection of chemicals and the health benefits are still unclear.
Methane reaches the atmosphere from a complex collection of human and natural sources.
The human gut microbiota represents a complex collection of microorganisms, which contribute considerably to host health.
The brain is a complex collection of billions of neurons, like a massive telephone exchange sending signals in all directions.
However, by 1920, General Motors had nearly collapsed because of the inability of Durant's management systems to control such a complex collection of business entities.
Judging by some displays at the Detroit auto show, the car, too, is becoming an extension of personal electronic devices, more like an Apple iPhone than a complex collection of mechanical bits.
It is a complex collection and integration of numerous systems, each one at its turn being the integration of diverse technologies into a coherent, space constrained, nuclearised design.
But his latest LP Reverse out today on Bureau B might be his most intense yet, a stunningly complex collection of four pieces that heave and flex under his monolithic guitar lines.
Across this sprawling, chaotic nation, workers are creating what will be the world's largest biometric database, a mind-bogglingly complex collection of 1.2 billion identities.
The seemingly disparate businesses and products all have the same foundation: Google's massive and rapidly growing collection of data, running on a mind-bogglingly complex collection of servers and networks that runs some of the world's most sophisticated software.
From the start, Godard repudiated the false merits of so-called production values, but he invested the film not with the elements of the usual Monogram movie but with a rich and complex collection of high-art references, intellectual divagations, and documentary-based techniques, all held together by an aesthetic philosophy that owed more to Sartre than to Hawks.
