紐解 ひもといたそうだ
himotoita sōda

Godan Verb (ku)
Evidential Auxiliary

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

1. It was said that [it] was untied.; It was said that [they] solved/unraveled [it].

Past/Perfective
Hearsay Evidence