The phrase "again concluding that" is correct and usable in written English.
It can be used when summarizing or reiterating a conclusion that has been reached previously in a discussion or analysis.
Example: "After reviewing the data multiple times, we are again concluding that the initial hypothesis was accurate."
Alternatives: "once more determining that" or "reaffirming that".
In 1999, Deci and his colleagues published a meta-analysis of 128 studies (see here), again concluding that when people do things in exchange for external rewards, their intrinsic motivation tends to diminish.
Then, in a lengthy comment added to the final edition of his essays, he completes the circle from animal-to-human to human-to-human again, concluding that we cannot help but communicate ourselves in some way – that our own physical movements "converse and discourse" – even if it is something to which we are habitually blind: What of the hands?
He stirs up a separatist movement in eastern Ukraine, once again concluding that we weren't likely to send in military support.
The party's leaders will once again conclude that they lost because their candidate was not a genuine conservative, and vow to find the real thing next time.
That review once again concluded that there was nothing in Mr. Kimmel's work that could have pointed to Mr. Hanssen earlier.
N.F.L. Commissioner Paul Tagliabue will then take another look at the contract he already has ruled is valid -- and again conclude that Belichick's services belong to the Jets.
As in earlier cases considering conduct prohibited by § 10(b), we again conclude that the statute prohibits only the making of a material misstatement (or omission) or the commission of a manipulative act.
Ten days earlier, the US boycotted an international conference in Geneva that once again concluded that the fourth Geneva convention applies to the occupied territories, so that many US-Israeli actions there are "grave breaches", hence serious war crimes.
Twenty-five years later, he was to serve on another inquiry into residential care, a commission led by the thinktank Demos in 2014, that again concluded that it was seen as a place of last resort.
The latest dire warnings from the UN's intergovernmental panel on climate change again conclude that if the world is going to avoid meltdown then we need to move to renewable energy sources pretty sharpish.
