Complex sentence: From 2009 to 2011, the official name of the league was Fair Play ligaen, and from 2012 to 2015 the name was Oddsen-ligaen (after the main sponsor Norsk Tipping's betting-game called Oddsen).
Split into simpler sentences: From 2009 to 2011, the name of the league was Fair Play ligaen. Since 2012, the official name of the league has been Oddsenligaen (after the main sponsor Norsk Tipping's betting-game called Oddsen).