Constructed in the ninth century by the Prince Booivoj, the castle has transformed oneself from a wooden fortress surrounded by earthen bulwarks to the imposing form it has today.

You may use the same words in many ways but the best way is only one that makes the perfect usage of the words and conveys the proper meaning of the expression.  In the questions below, a part of the sentence can be improved by one of the given options. improve the sentence.  In case no improvement is needed, your answer is 'No Improvement'.