Problem: OntheeasternbordersofEuropeRussia,undertheflagofChristendom,appearedtobejoininginthisprocessofnationalandindividualimprovement.
What's a sentence that uses these characters?
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On the eastern borders of Europe Russia, under the flag of Christendom, appeared to be joining in this process of national and individual improvement.
Add spaces: Oneofthemanyreasonswhybundlesofstalksmaybeinterestinglyassembledoneovereachother,couldprobablybeadominoeffect.

Answer: One of the many reasons why bundles of stalks may be interestingly assembled one over each other, could probably be a domino effect.
BelowthevideoILoveYoufromtheworkshop:

Below the video I Love You from the workshop:
[Q]: [Aftercloudswithlightraininthemorningvariablecloudswithisolatedrainshowerswilldominateforatime.]
[A]: [After clouds with light rain in the morning variable clouds with isolated rain showers will dominate for a time.]
Problem: Add spaces: Debianisparticularlyproudtohavebeendistinguishedonthisoccasion,havingnarrowlymissedreceivingtheawardOutstandingContributiontoOpenSource/Linux/FreeSoftwareinpreviousyears.

Spaces added: Debian is particularly proud to have been distinguished on this occasion, having narrowly missed receiving the award Outstanding Contribution to Open Source/Linux/Free Software in previous years.
Problem: Thechoicesareeithershort2-hourdeliverywindowsorhalf-daywindows.
What's a sentence that uses these characters?
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The choices are either short 2-hour delivery windows or half-day windows.