せいたかあわたてそうでわありませんでした
背高泡立草ではありませんでした
seitaka awatatesōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of せいたかあわだちそう

1. Was not tall foam-standing grass.; Was not a towering, unsubstantial presence.

Past/Perfective
Negative
Polite
Formal Register
Usually Written in Kana