Complex sentence: Sílvio was confirmed as an Atlético Madrid player on 19 May 2011, on a five-year deal, making his La Liga debut on 28 August in a 0--0 home draw with CA Osasuna in which he played the full 90 minutes.
Split into simpler sentences: Sílvio was confirmed as an Atlético Madrid player on 19 May 2011, on a five-year deal. He first appeared in La Liga on 28 August in a 0--0 home draw with CA Osasuna in which he played the full 90 minutes.