Add spaces: Hisjobisontheline.

Answer: His job is on the line.

Add spaces: ItiscalledKaleici,andconsistsofnumerousnarrowstreetswhichgivetheareaawonderfulatmosphere.

Answer: It is called Kaleici, and consists of numerous narrow streets which give the area a wonderful atmosphere.

Add spaces: TheNormaninvasionofBritainis,eventoday,describedinDanishhistorybooksasacivilwarbetweentwobranchesoftheDanishpeople.

Answer:
The Norman invasion of Britain is, even today, described in Danish history books as a civil war between two branches of the Danish people.