Complex sentence: The arcade version of "SSFIV" added twin brothers Yan and Yung from the "Street Fighter III" series as playable characters, and introduced Evil Ryu and Oni as hidden bosses.
Split into simpler sentences: The arcade version of "SSFIV" added twin brothers Yan and Yung from the "Street Fighter III" series as playable characters. The game also introduced Evil Ryu and Oni as hidden bosses.