2 This is obviously wrong. "This is the cat that killed the rat that ate the malt that lay in the house that Jack built." – TKR yesterday
That seems wrong. Could you give an example? – lemontree yesterday
1 Yes he's either wrong, or using the terms "relative clause/relativized" in an unusual way. Can you post a larger excerpt of the passage where he claims this, as well as his Japanese examples of "further relativization"? – leoboiko yesterday
1 @TKR - your sample is not nested. This is: "The rat that the cat that Jack has was eaten." – amI 6 hours ago
1 @aml The question as stated seems to be whether NPs in a relative clause can themselves be relativized (i.e. be the antecedent of a relative clause), which they are in the example I gave. But this may be a bad formulation (see Greg Lee's answer). – TKR 4 hours ago