Dyma ’r dyn y credodd Dafydd [y si [y cest ti ’r llythyr ’na ganddo (fo)]].
here.is the man PRT believe.PAST.3SG Dafydd the rumour PRT get.PAST.2SG you the letter DEM with.3SG.M him
Here’s the man who David believed the rumour that you got that letter from.