Complex sentence: Some conspiracy theorists have argued that a six-year-old victim of the shooting subsequently appeared in a photograph with President Barack Obama, but the depicted child is the victim's sister wearing her deceased sister's dress.
Split into simpler sentences: Some conspiracy theorists claimed a six-year-old victim of the shooting subsequently appeared in a photograph with President Barack Obama. In fact, the child in the photograph is the victim's sister, wearing her deceased sister's dress.