Original sentence: The specific corpus of the Mahapuranas, as opposed to generic purana "ancient tale", is sometimes estimated by Western scholars to date to the Early Middle Ages, or to roughly between the fifth and tenth centuries, but to contain older material; according to Pargiter, an "original Purana" may date to the time of the final redaction of the Vedas
Edited sentence: The specific corpus of the Mahapuranas, as opposed to generic purana "ancient tale", are estimated to date to the Early Middle Ages, or to roughly between the fifth and tenth centuries, but to contain older material; according to Pargiter, an "original Purana" may date to the time of the final redaction of the Vedas