Hanako-ga Taroo-ni nanika-o ageta hito-ni atta soda ga, ... ... watashi-wa nani-o ka siranai.
HanakoNOM TarooDAT somethingACC gave personDAT met I.heard but I-TOP whatACC CQ° know-not
I heard that Hanako met a person who gave Taroo something, but I don't know what.