The story
On 30 April 2009, after divisions between Serie A and Serie B clubs regarding the future of the league, 19 of 20 top flight clubs (the only exception being U.S. Lecce) agreed on plans to split from Serie B to form another governing and financing body, with the same name Serie A, in a move reminiscent of England's Premier League formation in 1992. Subsequently, on 1 July 2010, the Lega Calcio has officially ceased to exist and replaced by the two newly formed leagues, Lega Serie A and Lega Serie B.
From Wikipedia’s article on Lega Nazionale Professionisti, shared under CC BY-SA 4.0.4