The given sentence contains a punctuation error in its subject i.e. The Medici's. Here the use of the apostrophe(') before 's' shows possession which is grammatically incorrect as it doesn't display any ownership and it is immediately followed by the non-restrictive clause that offers detail about it. Therefore, as per the context and meaning of the sentence, the apostrophe must be removed to give the noun its complete meaning and make the sentence semantically appropriate and lexically coherent. Thus, 'Medici's' would be converted to 'Medicis.'
