The phrase "a complicated one that" is correct and usable in written English.
It can be used when referring to a complex subject or issue that has been previously mentioned or is about to be elaborated on.
Example: "The problem we are facing is a complicated one that requires careful consideration and analysis."
Alternatives: "a complex issue that" or "a challenging matter that".
If Mr. Hampton's plea deal with federal prosecutors provides a cautionary tale about the abuse of political power, it is a complicated one that has left a number of legal and political observers befuddled by the Justice Department's contrasting treatment of Mr. Hampton and his onetime boss.
That's a long cycle to complete a transaction, but this is a complicated one that sees AT&T take control of Time Warner, as well as HBO, Warner Brother's film studio and its Turner channels.
The entire mining process is a complicated one that is beyond the scope of this article.
But he offered no new dollars today and characterized the problem as a complicated one that United States money by itself would not solve.
And the first thing I tell them to do is what I am telling you to do -- sit back, take a deep breath, don't over-think it, and always, always, always remember -- a simple story, well told, will get an applicant further than a complicated one that a college or university admissions person has read a million times before.
The matter of co-existence between Jews and Arabs is a very complicated one that has many aspects.
The process of transitioning from one gender to another is a long and complicated one that can take years and cost tens of thousands of dollars in hormones and surgical procedures; it is hard enough for people who have the money to pay for it.
That particular conflict between drag and trans folk is a nuanced and complicated one that can't be defined along a hierarchy of acceptable or unacceptable (Zack Ford's article for Think Progress explains this in much greater detail).
"I think it's because our offense is a very complicated one, that there is a lot of movement and intelligence to it, that gets translated as arrogance," Wallace said.
For we can describe the possible world of the thought experiment in a neutral way that specifies how things in the world appear to its denizens, without specifying whether the real freeze functions for Zones A, B, and C are the simpler ones described above that entail a global freeze every 30 years or the more complicated ones that do not have that entailment.
That said, it's hardly surprising that games and entertainment apps are clearly the most popular categories for both the iPhone and the iPad – both devices come with a high-quality touchscreen, boast powerful processors and are excellent for content consumption as well as playing anything from simple games fit for kids to complicated ones that require advanced gaming skills.
