Complex sentence: OLiS (Oficjalna Lista Sprzedaży;) is an official list of the highest selling music albums in Poland, existence since October 23,2000 and is provided by ZPAV.
Split into simpler sentences: OLiS (Oficjalna Lista Sprzedaży;) is the official list of the highest selling music albums in Poland. The list exists since October 23,2000 and is provided by ZPAV.