How to identify whether commas is required to separate prepositional phrases at the end of sentence? Why commas hve been used here?

Skims benefited from a well-timed introduction of pajamas and loungewear, [commas]with product lines such as the “cozy collection” bolstering sales as women have traded form-fitting styles for sweatpants.

Ms. Kardashian West said she was deeply involved in Skims, [comma]from helping to design fabrics and collections to picking photographers for product shoots to studying sales data.

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