The phrase "a complicated issue in" is correct and usable in written English.
It can be used when discussing a complex topic or problem within a specific context or field.
Example: "Climate change is a complicated issue in environmental science that requires careful consideration of various factors."
Alternatives: "a complex matter in" or "a challenging topic in".
"This is easy to demagogue, but it is a complicated issue in tax policy," said Senator Don Nickles of Oklahoma, the assistant Republican leader.
The minister said he told Ford that illegal logging was a complicated issue in Indonesia and required a more varied approach to stem it than simple force.
In her opening remarks, Mrs. Clinton said she was "very glad" Mr. Obama had made his speech, given that she said that race had been a "complicated" issue in America that had been marked by "pitfalls" and "detours".
"And you have to ask, when does a building stop being what it was?" It is a complicated issue, in part because it is not about something as heavy-handed as patching Carnegie Hall with asphalt siding.
The interaction effect between bounding frame and infill wall is a complicated issue in the experimental test.
However, ground vibration prediction is a complicated issue in consequence of the fact that a large number of influential factors are involved.
"It's a complicated issue since in-flight entertainment is usually aimed at the economy market.
"This is a complicated issue," he said in an interview.
Helen Lambert, chair of Caversham and District Residents Associationn, said the anniversary was a "complicated issue", as people in Caversham still felt ambivalent about being part of Reading.
A complicated issue like immigration in the United States deserves an evenhanded, well-thought-out solution.
This is a complicated issue, but its prominence in the current political debate means that journalists are heavily covering the story.
