Complex sentence: Although people with AA can process pure tones (single frequencies), most sounds are made up of different elements, which people with AA are unable to categorise properly because they can't "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 complex than this, as they are made up of different elements. People with AA are unable to categorise sound properly because they can't "link the auditory info they perceive to meaning" (Banish 198).