For example, the old church could be restored, to be as beautiful as it used to be.

restored 是动词 restore 的过去分词形式。restore 由前缀 re-（表示"重新"）和词根 store（储存、保存）组成，意思是"使恢复原状、修复"。restored 在这里表示"被修复"的状态。