Passive?

Hi, everyone.

Could someone change the passive voice of the part(in bold)of the sentence into active?

The part of a https://www.macmillandictionary.com/dictionary/british/coast_1 that is https://www.macmillandictionary.com/dictionary/british/considered to be of https://www.macmillandictionary.com/dictionary/british/special_1 https://www.macmillandictionary.com/dictionary/british/value_1, either because it is very https://www.macmillandictionary.com/dictionary/british/beautiful or for https://www.macmillandictionary.com/dictionary/british/environmental https://www.macmillandictionary.com/dictionary/british/reason_1, and that cannot therefore be https://www.macmillandictionary.com/dictionary/british/built_1 on.

Source: www.macmillandictionary.com/dictionary/british/heritage-coast