Complex sentence: His fingerprints were found in two of the flats where the killings took place, and his fingerprints also matched those found on the can opener used to mutilate Evelyn Oatley.
Split into simpler sentences: His fingerprints were found in two of the flats where the killings took place. And his fingerprints also matched those found on the can opener used to mutilate Evelyn Oatley.