Complex sentence: "Dirrty" was included on the setlists of Aguilera's three major concert shows, the first being the 2003 Justified & Stripped Tour and its extension The Stripped Tour as the opening song on the setlists.
Split into simpler sentences: Dirrty was included on the setlists of Aguilera's three major concert shows. For the 2003 Justified & Stripped Tour and Stripped Tour, it was the opening song on the setlists.