Complex sentence: By 1990 many people who had sported the hi-top fade started to move toward other men's styles, still, the hi-top remained common among many groups of young adults and teenagers for a few years longer.
Split into simpler sentences: By 1990 many people who had sported the hi-top fade started to move toward other men's styles. Still, the hi-top remained common among many groups of young adults and teenagers for a few years longer.