The phrase "and so posed" is correct and usable in written English.
It can be used to indicate that something was presented or positioned in a certain way as a result of a previous action or situation.
Example: "The question was complex, and so posed a challenge for the students during the exam."
Alternatives: "and thus presented" or "and therefore positioned".
These resolutions did not make it to the floor for debate and so posed little threat.
They zipped the play around all areas of the final third and so posed far more questions of the visitors.
One interpretation is that he knew that there is an innocent, historical, traditional English justification for the daubing of black facepaint in these circumstances and so posed happily.
Another, wider review of all 20,000 abstraction licences on rivers and groundwater found 15% were over-abstracted and already causing damage, 18% were over-licenced and so posed a threat if the quotas were fully used, and one-third were on the limit.
Thankfully Andrew Edge – a former EDL supporter who asked to be sent to prison after pelting police with bricks, bottles and cans in Birmingham – knows, and so posed with a placard demonstrating as such by their grave last week.
There he could challenge Quebec's clumsy Liberal premier, Jean Charest, and so pose a new threat to Canadian unity.
During the early days of the Putin administration, some experts suggested he might choose cooperation over confrontation in dealing with the West -- and so pose a greater challenge.
Much basic research on gene editing in plants isn't affected because these evaluations apply only to organisms released into the environment, and so pose hurdles at the field-trial or commercialization stage.
WASHINGTON, Nov. 7 - The Bush administration has failed to recognize that Al Qaeda is now a global Islamic insurgency, rather than a traditional terrorist organization, and so poses a much different threat than previously believed, says a senior counterterrorism official at the Central Intelligence Agency.
If you look at the example of vaccinations, conspiracies have a very tangible effect of making people less likely to vaccinate their children and so pose a threat to public health.
When this mechanism operates, we surmise that sexual violence is more likely to be reported and so poses risks to offenders.
