Complex sentence: Although people with AA can process pure tones (single frequencies), as most sounds are more complex than this, people with AA can't categorise them properly because they are "unable to link the auditory info they perceive to meaning" (Banish 198).
Split into simpler sentences: Although people with AA can process pure tones (single frequencies), most sounds are more containing different auditory elements, (cause problems). So People with AA can't categorise the sound properly because they are "unable to link the auditory info they perceive to meaning" (Banish 198).