The second comma (model, focuses) makes no sense at all. It sets "the French parenting model" off as a parenthetical clause, making the subject of the sentence "In contrast" when, clearly, it is not.
According to this apostrophe, only this lady can embark on the discovery offered in this magazine that hawks educational materials.
"Which" is not the fancier "that." "Which" signals a non-restrictive or non-essential clause -- one that is is not essential to the sentence. It should always be preceded by a comma. "That" signals a restrictive or essential clause -- it is essential to the meaning of the sentence. In this function, "that" is never preceded by a comma. Check out these sentences for clarification: Tom Jones abhorred the new leather pants that his mom made him. // Tom Jones abhorred the new leather pants, which his mom made him. In the first, it is essential to the sentence's meaning that his mom made the pants. In the second, this fact is more of an afterthought to the situation; his mom has a lot less to do with it. In our example above, guaranteeing that your writing will have accuracy and style is non-essential to what P.P. actually does (in addition to being another hilarious disconnect between content and form).