This is the 12806th most frequent Polish word.
niszczono
"Destroyed" (past tense, third-person singular or plural).
In this case, 'niszczono' refers to a general statement about destruction during a past event without specifying the subject.
W czasie wojny niszczono wiele zabytków.
During the war, many monuments were destroyed.
Here, 'niszczono' is used to describe a past action affecting the subject ('our plans'), in a passive manner.
Niszczono nasze plany poprzez wprowadzanie nowych reguł.
Our plans were destroyed by introducing new rules.
In this example, 'niszczono' denotes a passive action occurring due to a natural disaster.