成熟 せいじゅく分裂 ぶんれつではありませんでした
seijukubunretsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 成熟分裂

1. Was not mature cleavage.; Was not mature division.

Past/Perfective
Negative
Polite
Formal Register