The phrase "were again able to" is correct and usable in written English.
You can use it to express the idea that something happened a second time and achieved a successful result. For example: "After the strike ended, the workers were again able to return to their jobs."
Arsenal were again able to react to a pressure situation.
We were again able to understand this from references to fluid vortices, also in our physics books.
To test this, they embed it in a pork chop and were again able to receive signals on their Samsung Galaxy S4 smartphone.
When the Khmer Rouge were overthrown in 1979, some Bangkok collectors were again able to fill their homes and shops with stolen art from the Angkor region.
Using this technology, Antonio and Hanna Damasio and, later, other researchers were again able to confirm Dejerine's findings, and to correlate their alexic patients' symptoms with highly specific brain lesions.
Northern politicians grew increasingly conciliatory to the white South, so that by 1872 virtually all leaders of the Confederacy had been pardoned and were again able to vote and hold office.
In the early 1920s, Arrhenius was again able to travel on the Continent and to England.
Claude Chabrol was again able to make the kind of sardonic bourgeois melodrama he had intended.
But at times, Mr Putin seems bent on proving only that Russia is again able to say nyet.Take the Balkans.
The CNRT won a plurality (but not a majority) of seats in the 2012 legislative elections, and Gusmão was again able to form a coalition government.
Through a recent experimental neural retraining program based on advances in stroke rehabilitation, I am again able to function in the "real world" without a respirator.
