Complex sentence: The Mercenaries 3D, known as in Japan, is a third-person shooter video game developed by Capcom for the Nintendo 3DS, and announced at the 2010 Nintendo conference in Japan.
Split into simpler sentences: The Mercenaries 3D, known as in Japan, is a third-person shooter video game developed by Capcom for the Nintendo 3DS. The game was announced at the 2010 Nintendo conference in Japan.