The phrase "a vastly more complex" is correct and usable in written English.
It can be used when comparing the complexity of one thing to another, emphasizing a significant difference in complexity.
Example: "The new software system is a vastly more complex solution than the previous version, requiring additional training for users."
Alternatives: "significantly more intricate" or "far more complicated".
If this were not so, banking would be a vastly more complex business.
The agency must produce draft standards for existing plants, a vastly more complex and controversial undertaking, by next June.
But Professor Vladeck says Mr. Johnson led a vastly more complex enterprise; a receiver's report to the court describes it as a "spider web of entities".
The nation's school-age population has been rising since at least the mid-1980's, but the children now attending elementary and secondary school are a vastly more complex population than during the baby boom of their parents' generation.
But after months in which Mrs. Clinton and Mr. Giuliani courted a state in which most voters seemed firmly set in their positions, both campaigns have concluded that Mrs. Clinton and Mr. Lazio are now facing a vastly more complex and fluid political picture.
It is a vastly more complex system to design, house, optimize, make usable, and maintain.
He continues, "these tiny acts of violence serve as snapshots of a greater and vastly more complex reality".
In fact, the life of a government leader is vastly more complex and high-impact than that of a private-sector counterpart.
The mid- p test did not violate the nominal level in any of the 9595 scenarios considered in this article and is thus an excellent alternative to the vastly more complex exact unconditional test.
If we can't figure out an enduring, unhackable storage mechanism for data, how can we hope to find a permanent resting place for the vastly more complex and multifarious "connectome" wiring our brains?
"Here and there, people here are recognizing that the Arab world, and this grand nation which is its cultural epicenter, is vastly more complex than this view of a vast sea of blood-eyed fanatics barely restrained by the brittle dikes of a heavily subsidized corps of despots".
