This is the 10930th most frequent Turkish word.
değiştirilmişti
"Değiştirilmişti" means "It had been changed."
In this sentence, 'değiştirilmişti' implies that the modification to the design of the structure was done prior to the completion of its restoration.
Tarihi bir yapının orijinal tasarımı restorasyon sırasında değiştirilmişti.
The original design of the historical structure had been modified during restoration.
'Değiştirilmişti' is used to indicate that the modifications to the contract provisions had already been carried out in the past before another point in time.
Sözleşmenin maddeleri son dakika değişikliğiyle değiştirilmişti.
The provisions of the contract were changed at the last minute.
'Değiştirilmişti' here suggests that the alteration of the research results occurred in the past, likely after further understanding or analyses.