The Parthenon was a church from 1204 until 1456, when Athens was taken by General Mohammed the Conqueror, the Turkish sultan,who established a mosque in the building and used the Acropolis as a fortress.
The underlined clause is a modifier modifying 'Turkish sultan'. Notice that the timeline is - parthenon was a church-then the conquest-then the mosque came about.
The original sentence follows correct tense.
(A) who established a mosque in the building and used the Acropolis as
(B) who, establishing
...
The underlined clause is a modifier modifying 'Turkish sultan'. Notice that the timeline is - parthenon was a church-then the conquest-then the mosque came about.
The original sentence follows correct tense.
(A) who established a mosque in the building and used the Acropolis as
(B) who, establishing
...


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