Complex sentence: However, Chinese documents written prior to the twentieth century rarely mentioned the Wa as headhunters and yet it is this aspect of Wa culture that has been cited more than any other in order to emphasize the primitiveness of the Wa'.
Split into simpler sentences: However, Chinese documents written prior to the twentieth century rarely mentioned the Wa as headhunters. But it is this aspect of Wa culture that has been cited more than any other in order to emphasize the primitiveness of the Wa'.