共同 きょうどう創立 そうりつ しゃではありませんでした
kyōdōsōritsushadewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 共同創立者

1. Was not a co-founder.; Was not a joint founder.

Past/Perfective
Negative
Polite
Formal Register