Complex sentence: The large Kosovar diaspora which had built up in Western Europe during the 1990s combined with the political instability created ideal conditions for Kosovo to become "Europe's crime hub"; well into the 2000s, Kosovo remained associated with both ethnic conflict and organized crime.
Split into simpler sentences: The large Kosovar diaspora which had built up in Western Europe during the 1990s combined with the political instability created ideal conditions for Kosovo to become "Europe's crime hub". Well into the 2000s, Kosovo remained associated with both ethnic conflict and organized crime.