Problem: Add spaces: Therewillbeconsiderabledifferencesforsinglesubstances;alsoseeninthisstudy,butsimplequalitativeextrapolationofskinabsorptiontoplacentapassageisanticipated.Generallyandquantitativeextrapolation,however,arenotexpected.

Spaces added: There will be considerable differences for single substances; also seen in this study, but simple qualitative extrapolation of skin absorption to placenta passage is anticipated. Generally and quantitative extrapolation, however, are not expected.
This text is missing some spaces, please add them: Note:writtenpriortoJuly15,1995Regardingtheaccuracyofourprediction,latespring,earlysummer,intheyear2003.
Note: written prior to July 15, 1995 Regarding the accuracy of our prediction, late spring, early summer, in the year 2003.
input question: Fix spacing: AccepttheupgradeofferthatisdisplayedontheWindows7orWindows8system.

output answer: Accept the upgrade offer that is displayed on the Windows 7 or Windows 8 system.
Problem: TheclosestairportforSaintJeanPieddePortis:
What's a sentence that uses these characters?
-
The closest airport for Saint Jean Pied de Port is:
Add spaces: Thestreetlampsdulllightexposedonalongshutterspeedmakesthebunkermysterious,unreal,asifithidesashockingtruth.Aconcreteblockofunapproachableequality.

Answer: The streetlamps dull light exposed on a long shutter speed makes the bunker mysterious, unreal, as if it hides a shocking truth. A concrete block of unapproachable equality.
This text is missing some spaces, please add them: GirlsquinatagrapesorgrapeVirginia-P.quinquefolia(L.)Planch.
Girls quinata grapes or grape Virginia - P. quinquefolia (L.) Planch.