姓名 せいめい不詳 ふしょうではありませんでした
seimeifushōdewārimasendeshita

Noun
Desu Copula
no-Adjective

The polite, past negative form of 姓名不詳

1. Their name was not unknown.; Their identity was not unclear.

Past/Perfective
Negative
Polite
Formal Register