When the clock strikes twelve o’clock at midnight twelve bells rings announcing the New Year that has just begun.
What I meant was twelve (bells' rings). So some bells ring twelve times. Is my sentence incorrect?
But I don't think native speakers would say "twelve bells' rings announce". That sounds quite odd, and I would not say that.
You could say 'twelve bell rings announce'. And my guess is that there are not (several)(twelve) bells ringing, but one bell ringing twelve times.