I'm having trouble with a GMAT SC question. The answer says the following sentence is incorrect. The correct answer is to replace
turned are parallel.
Grammatically speaking, why is it wrong to use
persuading in parallel with
Joan of Arc, a young Frenchwoman who claimed to be divinely inspired, turned the tide of English victories in her country by liberating the city of Orléans and persuading Charles VII of France to claim his throne.