Complex sentence: One of the most severely injured was George Connelly, who had tried to save horses trapped in fire in a car stall; two of the horses died, but George saved one of them, and was mentioned as a hero by the media.
Split into simpler sentences: One of the most severely injured was George Connelly due to his trying to save horses that were trapped in fire in a car stall. Two of the horses died, but George saved one of them, and was mentioned as a hero by the media.