The phrase "an added complication was" is correct and usable in written English.
It can be used when introducing a new difficulty or issue that has arisen in a situation or discussion.
Example: "The project was already behind schedule, and an added complication was the sudden departure of the team leader."
Alternatives: "a further challenge was" or "an additional issue was".
Sat Bir S. Khalsa, the study's author and a sleep researcher at the Harvard Medical School, said an added complication was that "the vast majority of these studies have been small," averaging 30 or fewer subjects per arm of the randomized trial.
Mr Mutton from Netcraft said an added complication was being introduced by firms that issued new certificates but had not revoked the older potentially vulnerable ones.
Decisions about which groups should get which swine flu vaccine batches first "should be made locally," Dr. Butler said, noting that an added complication was that no one yet knew how much demand there would be for all the 195 million doses the government had ordered.
An added complication was that Pauling was about to visit London and Crick feared that Dr. Franklin, who hoped to see him, might give him her experimental data on DNA, enabling him to guess and announce the structure before the articles then in press with Nature were published.
An added complication was whether there were any symptoms and signs of a space occupying lesion or not in patients in the included studies.
An added complication was that we did not have equal numbers of tumours in each category (see supplementary material Table S1).
But the added complication is the historic practice of chalk mining.
But the added complication is that Republicans want to delay implementation of the Affordable Care Act, the president's healthcare law and his signature legislative accomplishment.
Such executive maneuvers always upset the president's political opponents, but this time there's an added complication: It's unclear whether the Senate was truly in recess.
But there's an added complication, which is activist shareholders, and their increased presence seems to me different from the normal ebb and flow among the three parties.
And Rio Tinto features an added complication that is especially relevant for politicians who for years have been clamoring for tougher sanctions on Iran: Among the company's far-flung enterprises is the Rossing uranium mine in Namibia, which is jointly owned by the government in Tehran, which holds a 15.3percentt stake.
