Complex sentence: The 2016--17 Southern Counties East Football League season was the 51st in the history of the Southern Counties East Football League, a football competition in England, and is the first year the competition has two divisions, having merged with the Kent Invicta Football League.
Split into simpler sentences: The 2016--17 Southern Counties East Football League season is the 51st in the history of the Southern Counties East Football League, a football competition in England. It is the first year the competition has two divisions, having merged with the Kent Invicta Football League.