共同 きょうどう創設 そうせつ しゃじゃありませんでした
kyōdōsōsetsushaja arimasendeshita

Noun
Desu Copula

The polite, past negative form of 共同創設者

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

Past/Perfective
Negative
Polite
Terminal Form