爆発 ばくはつ せい戦争 せんそう残存 ざんぞん ぶつでした
bakuhatsuseisensōzanzo mbutsudeshita

Noun
Desu Copula

The polite past form of 爆発性戦争残存物

1. Was explosive remnants of war.

Past/Perfective
Polite