Complex sentence: Moran's arguments included the facts that no eyewitnesses or survivors ever testified and that Gribble allegedly had a history of making false claims about the murder and mistreatment of Aborigines and was known to have had a history of mental illness.
Split into simpler sentences: Moran's arguments included the fact that no eyewitnesses or survivors ever testified. Moran also reports that Gribble allegedly had a history of making false claims about the murder and mistreatment of Aborigines and was known to have had a history of mental illness.