Complex sentence: The Forgotten Massacre, dilatorily named Jackson as one of the bombers, however three of his alleged accomplices Billy Hanna, Harris Boyle, and Robert McConnell were directly named.
Split into simpler sentences: The Forgotten Massacre, referred to Jackson indirectly as one of the bombers. However, three of his alleged accomplices, Billy Hanna, Harris Boyle, and Robert McConnell were directly named.