Complex sentence: However, early elections may be called following the resignation of Prime Minister Boyko Borisov following the defeat of Tsetska Tsacheva, the candidate of his GERB party, in the November 2016 presidential elections.
Split into simpler sentences: However, early elections may be called following the resignation of Prime Minister Boyko Borisov. Borisov resigned following the defeat of Tsetska Tsacheva, the candidate of his GERB party, in the November 2016 presidential elections.