Well, if the single sentence description is supposed to also describe the popularity, then every musical group in Wikipedia would need to be described by that metric. It might get a bit absurd very fast. (“…a bit obscure band which was really really big in Japan at one point”)

So how big were the Spice Girls? Well, they were big enough to warrant a Wikipedia article, if that is any metric worth of anything. I guess if you need to compare statistics, perhaps you need a deeper dive than a single sentence summary!