The given sentence, taking into account the grammar of the sentence, the conjugation of the verb and its order within the sentence is: incorrect.
To carry out a clear reasoning as to why the sentence is incorrect, the order of the subject, the direct object pronoun and the verb must be reviewed, which are found correctly within the sentence.
The mistake lies in the use of the verb "estur," to mention that Gallia has been bound by the Romans, when the correct form of the verb would be "est," resulting in the sentence: "Gallia a Romanīs vincta est."
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