Complex sentence: Without an official hearing the sisters were taken to Grovely Wood, murdered by being bludgeoned over the head, and buried a little way apart from each other so that they could not conspire against their murderers.
Split into simpler sentences: Without an official hearing the sisters were taken to Grovely Wood and murdered by being bludgeoned over the head. The sisters were then buried in the woods a little way apart from each other so they could not conspire against their murderers.