How many hens are with this rooster? If less then 10 or 12 some will get to much attention from him. You can try hen saddles/protectors or you can keep the rooster separate for a while and let the hens rest and heal up.
How old are your hens and what are you feeding them? There are a lot of reasons chickens can stop laying and there is no magic bullet to make them suddenly start again. Make sure they are getting good nutrition, check for lice/mites, deworm them if they aren't on a regular deworming schedule...