Complex sentence: Namco and Capcom agreed to create crossover games of the "Tekken" and "Street Fighter" franchises, "Street Fighter X Tekken" (released in 2012) and "Tekken X Street Fighter" (in development).
Split into simpler sentences: Namco and Capcom agreed to create crossover games of the "Tekken" and "Street Fighter" franchises. In 2012, "Street Fighter X Tekken" was released, followed by "Tekken X Street Fighter" (in development).