Complex sentence: They have a quick fight, the white haired kid shows off his personal Mysticker, Valiant, they come to a draw just before the girl comes around and explains everything the two of them are Guardians also, Tamaki and Shiro with a creature they call Pettan.
Split into simpler sentences: They have a quick fight, and the white haired kid shows off his personal Mysticker, Valiant. The two of them are also Guardians, Tamaki and Shiro with a creature they call Pettan.