Complex sentence: Modrić started in Real Madrid's home game against their league rivals Barcelona on 2 March 2013; from a corner kick he assisted Sergio Ramos to score the winning goal in the 82nd minute, giving Real a victory in the El Clásico derby.
Split into simpler sentences: Modrić started in Real Madrid's home game against their league rivals, Barcelona, on 2 March 2013. He assisted teammate, Sergio Ramos, from a corner kick to score the winning goal in the 82nd minute, giving Real victory in the El Clásico derby.