'sophisticated plans' is correct and usable in written English.
You can use it to describe intricate and complex plans. For example, "He devised some sophisticated plans to streamline the workflow of the company."
Not surprisingly, careful and sophisticated plans were developed about how to organise the world.
Thom Yorke and the rest of the band have yet to comment on Hanley's sophisticated plans.
We have learned by now, or should have, that the best-intended designers of aid programs can make ghastly mistakes in their sophisticated plans.
McGeorge Bundy, who served as national security adviser to Presidents Kennedy and Johnson, showed some of the elaborate and sophisticated plans to one of his aides.
Over the next few days, Ms. Takala took the children to the park, then to a film studio and spent a bit more time discussing their ideas, which led to more sophisticated plans for how to spend the money.
The good news is that many poor and hungry countries already have elaborate and sophisticated plans for their smallholder farmers, but until now they've lacked the financial means and donor support to put those plans into action.
"We went from a raw plan to a more sophisticated plan to a final plan".
The report identified several Russian officials who had engaged in sophisticated planning dating back years.
But Obama had a sophisticated plan to get them to the polls.
For the 52-year-old Mr. Lynch, there was no time to prepare a sophisticated plan of action.
The attacks renewed fear of a stubborn insurgency that has demonstrated its ability in the past six months to carry out spectacular attacks requiring sophisticated planning.
