Complex sentence: A journalist affiliated with the newsmagazine travelled to Taiwan to investigate the dormitory, the alleged scene of crime, which the Finnish police had not done; they merely interviewed persons who were acquainted with the place.
Split into simpler sentences: A journalist affiliated with the newsmagazine travelled to Taiwan to investigate the dormitory, the alleged scene of crime, which is something that the Finnish police never bothered to do. Instead of investigating the crime scene, the Finnish police merely interviewed persons who were acquainted with the place.