The game could really be explained quite concisely. The entire game, Real Madrid created more chances than Barcelona and won the ball better than them. However, Barcelona only had to have scraps and Lionel Messi feeds on them. Lionel Messi again was the creative focus of the team.
"There is often a fierce rivalry between the two strongest teams in a national league and this is particularly the case in La Liga, where the game between FC Barcelona and Real Madrid is known as El Clásico. From the start the clubs were seen as representatives of two rival regions in Spain, Catalonia and Castile, as well as of the two cities themselves. The rivalry projects what many regard as the political and cultural tensions felt between Catalans and the Castilians."—Footballtickets.com