The phrase "a complicated approach" is correct and usable in written English.
You can use it when describing a method or strategy that involves many intricate or difficult elements.
Example: "The researchers adopted a complicated approach to solve the multifaceted problem of climate change."
Alternatives: "a complex method" or "a convoluted strategy."
Many Democrats are an uneasy combination of realpolitik and "gesture politics," which makes for a complicated approach toward governing.
"At first blush," Dr. Young said, "this seems to be a complicated approach to encouraging consumers to get the shots they need".
Congress is considering a complicated approach that would set a limit, or cap, on emissions that would be reduced each year.
A complicated approach was adopted, which made use of quinine - a drug obtained from tree bark which had long been used to combat fever, but was now seen as a crucial part of the war on malaria.
The math committee has recommended a complicated approach that effectively will compare the ninth grade test results this year and last, and then raise this year's ninth grade scores so they will appear similar to last year's ninth grade scores -- and will adjust other scores to match those.
Unfortunately, the complexity of developing such systems is impractical for most laboratories; hence, a less complicated approach to generating un-natural amino acid side-chains has been employed.
Google has been in talks with program providers, including cable channels, about distribution over the Internet, a more complicated approach — the cable systems that distribute programming would be left out of the mix — with a higher risk in execution.
Other artists have a less complicated approach to promoting their message however – we watched Tove Lo slowly cultivate a week-long hangover, and Elliphant and MØ behaved disgracefully in the back of a cab – proving that all you really need to score a hit video these days is a bottle of sambuca and a cabbie willing to let you chuff a fag on the back seat.
Our findings indicate that mutations to, or otherwise altered expression of, single genes in the solvent-producing pathway are insufficient to increase significantly the butanol fermentation; a more complicated approach involving alterations in the expression of multiple genes is required.
