Complex sentence: It is divided between Serbia and Hungary, with small uninhabited pockets of land on the left bank of the Danube which, according to Badinter Commission belong to Croatia, but are under Serbian control since 1991 ("see disputes of Croatia and Serbia").
Split into simpler sentences: It is divided between Serbia and Hungary, however, there are small uninhabited pockets of the area on the left bank of the Danube which are parts of Croatia imposed by Badinter Commission. Nonethless, the disputed areas have still been under Serbian control since 1991 ("see disputes of Croatia and Serbia").