Thanks for sharing the research, it's fascinating that there has actually been serious investigation of this. That being said, I still think the rule of 1 leve

Thanks for sharing the research, it's fascinating that there has actually been serious investigation of this. That being said, I still think the rule of 1 level still makes sense (not that all 1 level embeds are valid or easy, but that all embeds beyond 1 level are invalid). > Anyone [who saw [the woman who committed the crime] at any point] should be questioned. That sentence has two complementisers, which the OP's sentence specifically did not. Introducing complementisers completely changes the rules and I think makes embedding much more possible.