Complex sentence: Kenny, having never encountered racism of this magnitude before, is unable to process what has happened--he ran to the church moments after the bombing took place as he believed his sister to be in the building, and saw the aftermath.
Split into simpler sentences: Kenny, having never encountered racism of this magnitude before, is unable to process what has happened. He ran to the church moments after the bombing took place as he believed his sister to be in the building, and saw the aftermath.