Complex sentence: Svetlana Ražnatović held on to the role for a short period and decided that it wasn't something she was interested in and gave the seat away to Žarko Nikolić who held the title for about a year.
Split into simpler sentences: Svetlana Ražnatović held on to the role for a short period and decided that it wasn't something she was interested in. Then she gave the seat away to Žarko Nikolić who held the title for about a year.