'no less complex' is correct and usable in written English.
You would use this phrase when you want to express that something is at least as complex as something else, or even more complex. For example, you could say, "The tax code is no less complex than the legal system."
The international experience is no less complex.
Another six images flashed up, no less complex in their composition than the first set.
Packing this all into a small house was no less complex than "designing a submarine".
In that fundamental sense, Ferneyhough's music is no more and no less complex than any other classical music.
Nights At The Circus (1984) and Wise Children are no less complex but more ribald and relaxed.
It may involve a different set of variables than performing Puccini, but it is no less complex a demonstration of multi-tasking.
After it's passed, neuromuscular disease care should be commissioned on a national basis and so similar approaches will hopefully be rolled out elsewhere, but it will be much harder for small-scale, local commissioners to give comparable attention to my no-less-complex MS or Parkinson's patients, who will be collectively fewer in number and easily lost up against more common conditions.
Future work is needed to find out how they solve this task, and why learning is less effective than an apparently no-less-complex 2D maze.
Why should outsiders have feelings any less complex?
The spokesman went on: He has always been clear that this is a complex problem, it is no more or less complex than it was last week.
The findings reveal that alliance contracts vary greatly in their complexity, yet contracts for non-equity alliances tend to be no more or less complex than those for equity alliances on average.
