なしたそうだ
為したそうだ
nashita sōda

Godan Verb (su)
Evidential Auxiliary

Expresses hearsay about a past event ("I heard that...") of なす

1. It is said that (someone) did.; Apparently (someone) did.; I heard (someone) did.

Past/Perfective
Hearsay Evidence
Usually Written in Kana