Complex sentence: The most recent variation of the wallet came with the introduction of contactless payment acceptance on the network in 2012, where light-green "Watch out for card clash" wallets have been issued to raise awareness of "card clash", and replace previous designs.
Split into simpler sentences: The most recent variation of the wallet came with the introduction of contactless acceptance on the network in 2012. Light-green "Watch out for card clash" wallets have been in circulation; to raise awareness of "card clash", and replace previous designs.