Complex sentence: In reality hundreds of people were involved in the recovery of Ötzi and are still involved in studying the body and the artifacts found with it, that a small percentage of them have died over the years is not peculiar.
Split into simpler sentences: In reality hundreds of people were involved in the recovery of Ötzi and are still involved in studying the body and the artifacts found with it. The fact that a small percentage of them have died over the years is not peculiar.