天変てんぺん異説いせつではありませんでした
tempenchiisetsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 天変地異説

1. It wasn't a theory of cataclysmic events.; It wasn't the theory of natural disasters.

Past/Perfective
Negative
Polite
Formal Register