Complex sentence: This murder was a turning point for the investigations: the delict was connected to the murder of Stela Truya and, later, to the death of the other prostitutes thank to the ballistic studies of the RIS of Parma that discovered the uniqueness of the weapon used.
Split into simpler sentences: This murder was a turning point for the investigation since the crime was connected to the murder of Stela Truya and, later on, to the murders of the other prostitutes. It was the ballistic studies of the RIS of Parma that revealed the uniqueness of the weapon used.