Complex sentence: Police were never able to obtain enough evidence for charges in the murders of Neil Muir and Peter Stogneff, though in the case of Muir an Adelaide doctor was tried for his murder in 1980 but was found not guilty.
Split into simpler sentences: Police were never able to obtain enough evidence for charges in the murders of Neil Muir and Peter Stogneff. In the case of Muir an Adelaide doctor had been tried for his murder in 1980 but was found not guilty.