Complex sentence: The company operated only in Slovenia until the 1990s, and later started opening retail stores in other countries in the Balkans, with future plans to spread on the markets outside the territories of the former Yugoslavia.
Split into simpler sentences: The company operated only in Slovenia until the 1990s, and later started opening retail stores in other countries in the Balkans. Their future plans are to spread on the markets outside the territories of the former Yugoslavia.