Add spaces: BU34:Leisureactivitiesamongexposedchildrenandyoungpeoplebyage,sex,unitandfrequency

Answer: BU34: Leisure activities among exposed children and young people by age, sex, unit and frequency

Add spaces: StefanSommerreceiveshonorableprizeattheIPMIconferenceUniversityofCopenhagen

Answer: Stefan Sommer receives honorable prize at the IPMI conference University of Copenhagen

Add spaces: Butthedisarrayintroducedintotheranksoftheworkingmassesthemselvesbyaterroristattemptismuchdeeper.

Answer:
But the disarray introduced into the ranks of the working masses themselves by a terrorist attempt is much deeper.