Complex sentence: The anger-inducing aspect of the "salting" is that many of the artefacts used for this were genuine, which means that they were removed from their original context (at sites as far afield as Switzerland), thus losing most of their archaeological information.
Split into simpler sentences: The anger-inducing aspect of the "salting" is that many of the artefacts used for this were genuine. Which means that they were removed from their original context (at sites as far afield as Switzerland), thus losing most of their archaeological information.