Add spaces: Morethan600participantsfromallEuropeancountrieshavecontributedtothecontest.

Answer: More than 600 participants from all European countries have contributed to the contest.

Add spaces: Youarethenewmanag[...]

Answer: You are the new manag [...]

Add spaces: Atthetimewhenthecaveswerediscovered,thewholeworldwasastonishedbypaintings’highartisticlevel.

Answer:
At the time when the caves were discovered, the whole world was astonished by paintings’ high artistic level.