Peter₁ hat [ t₁ die Frau₂ , [ die₂ das Angebot , [ EA sich/ ihn weiterzubilden] gemacht hat], neulich erst im Supermarkt getroffen].
Peter has  the woman  who the offer  REFL/ him further.to.train made has recently only in.the supermarket met
Only recently, Peter has met the woman in the supermarket who offered to further educate him/herself.