Though H&M's business has been struggling as of late, other H&M group brands have been doing well, according to the company's CEO, Karl-Johan Persson. Cos, which launched in 2007, is focused on timeless, minimalist designs sold in a modern setting. & Other Stories, launched in 2010, offers shoes, bags, accessories, beauty products, stationery and women's clothing. H&M tries to follow trends and sells an abundance of styles in stores, but its sister stores tend to be more timeless and…