The phrase "a complicated problem which" is correct and usable in written English.
It can be used when introducing a clause that provides additional information about a complicated problem.
Example: "The researchers faced a complicated problem which required innovative solutions to address the underlying issues."
Alternatives: "a complex issue that" or "a challenging situation which".
Weed detection is a complicated problem which needs several sources of information to be gathered for successful discrimination.
The carbon tax is an elegant solution to a complicated problem, which allows the everyday business of consumer decision making to do the work of emission reduction.
She added however that seven-day care is a "complicated problem which will not be easily resolved by one single 'quick fix"'.
The short-term hydrothermal generation scheduling (SHGS) problem considered valve-point effects and transmission losses is a complicated problem which has the characteristics of nonlinear and non-convex.
The research on the mechanics of flood infiltration induced dike collapse and its evaluating method is a complicated problem which is difficult to be solved and interested by academic field and engineering field.
Identifying unoccupied frequencies is a complicated problem which involves sampling many points on the radio spectrum.
Fluid solid interaction is a very complicated problem which involves both structural and fluid dynamics.
Given the superior performance of ARP, the next section focuses on the ARP scheme for a more complicated problem which includes the research of the best sub-carrier pairing to maximize the capacity under interference and power constraints.
However, there is a very complicated problem, which I have already mentioned.
The classical technique used so far in studying this problem is to convert the energy functional, naturally defined by a modular, to a convoluted and complicated problem which involves a norm (the Luxemburg norm).
The classical technique used so far in studying this problem is converting the energy functional, naturally defined by a modular, to a convoluted and complicated problem which involves a norm (the Luxemburg norm).
