Complex sentence: The 2013 Glava Tour of Norway was the third edition of the Glava Tour of Norway cycling race, held over a period of five days between 15 and 19 May 2013.
Split into simpler sentences: The 2013 Glava Tour of Norway was the third edition of the Glava Tour of Norway cycling race. It was held over a period of five days between 15 and 19 May 2013.