'complicated implementing' is a correct and usable phrase in written English.
You can use it to describe a difficult process of implementing something, for example: "The government faced a complicated implementing process when introducing the new tax reforms."
In object-oriented program design language, often use the thread to implement an application program parallelism, however, synchronization and communication between threads are often very complicated to implement and can not take full advantage of multi-core advantage.
In some cases, developers deliberately forget about security because they think it'll be ok or it's too complicated to implement.
Finance industry figures agreed that a Tobin tax would be complicated to implement and unlikely to be agreed by countries keen to protect rival financial centres.
It never got off the ground — too complicated to implement, apparently, as the crisis worsened and the Bush Administration ran out of time.
"We're dealing with transnational actors, and the definition of a principle that is not recognized outside of France would be complicated to implement," she said.
"Bactrim is very cheap, and it's not too complicated to implement, so if they have good data on mortality, I'm sure it's a good decision," said Bernard Pecoul, director of the group's Access to Essential Medicines campaign.
A possible "Tobin-type tax on all financial transactions was effectively ruled out by the high-level group which argued that it was complicated to implement because it would require global agreement.
Unsurprisingly, it has proved complicated to implement (and has often failed wildly), but, at least in theory, it is far more graceful than police officers or the military blasting their way across human terrain.
Even when rules have been agreed upon at the E.U. level, they have often proved complicated to implement, partly because the Union has no direct powers over the energy mix of its member states.
