Complex sentence: Unfortunately, as a result of military activity and social cataclysms the collection were nebulized on different cities and museums of the Ukraine and other states, a lot of priceless artifacts were lost beyond retrieval.
Split into simpler sentences: Unfortunately, as a result of military activities and social cataclysms those collections were nebulized to different cities and museums of Ukraine and other countries. A lot of priceless artifacts were lost beyond retrieval.