Complex sentence: Through a partnership with Polyphony Digital, The Stig's helmet and overalls are available for purchase in the videogames "Gran Turismo 5" and "Forza Motorsport 4" as avatar items.
Split into simpler sentences: Through a partnership with Polyphony Digital, The Stig's helmet and overalls are available for purchase in the videogames "Gran Turismo 5". Other appearances of the Stig in videogames include "Forza Motorsport 4" as avatar items.