I haven't a clue what a relative clause on an element extracted from a nominalised complement means. I was never taught grammar of any sort at school, so my answers might not be grammatically correct. But this is how I would say them, and another native speaker would correctly interpret their semantics. >1. The man that John said saw Mary isn't in the room Nid yw'r dyn a dwed John welodd Mary yn yr ystafell >2. The man that John said had seen Mary isn't in the room Nid yw'r dyn a dwed John oedd wedi gweld Mary yn yr ystafell >3. The man that Peter says I know has a hat Mae het gyda'r dyn a dwed Peter 'rwyf yn ei adnabod >The ducks that she says Peter's brother used to feed are very tame Mae'r chwid a dwed hi yr arferodd brawd Peter ei bwydo'n ddof iawn. Gobeithaf ei fod o gymorth, Huw.