Complex sentence: Western'Basque' Europe and Northern'Uralic' Europe were inhabited by hunters of large animals which were abundant during that period and spoke languages related respectively to modern Basque and Uralic.
Split into simpler sentences: Western'Basque' Europe and Northern'Uralic' Europe were inhabited by hunters of large animals that were abundant. The people spoke languages related respectively to modern Basque and Uralic.