Complex sentence: After a 2016 referendum in the UK resulted in 51.9% of votes being cast in favour of exiting the European Union, the Front National leader Marine Le Pen promised a French referendum on EU membership if she were to win the 2017 presidential election.
Split into simpler sentences: After a 2016 referendum in the UK resulted in 51.9% of votes being cast in favour of exiting the European Union, French. The Front National leader Marine Le Pen promised a French referendum on EU membership if she were to win the 2017 presidential election.