Add spaces: ApushofabuttonandwefindourselvesontheothersideoftheMilkyWay.

Answer: A push of a button and we find ourselves on the other side of the Milky Way.

Add spaces: Maybesome"unfortunate"girlsnevermarriedandpursuedcareersbut,asfaraswomenmathematicianswent,IneversawonethewholetimeIwasastudent.

Answer: Maybe some "unfortunate" girls never married and pursued careers but, as far as women mathematicians went, I never saw one the whole time I was a student.

Add spaces: Comparedtolifecyclestudieswithashorttimehorizon(suchasthoserelatingtopurchaserequirementsorecolabellingofproductsontheexistingmarket),studieswithalongtimehorizonmustdealwiththefollowingchangingconditions:

Answer:
Compared to life cycle studies with a short time horizon (such as those relating to purchase requirements or ecolabelling of products on the existing market), studies with a long time horizon must deal with the following changing conditions: