when you re-veg the new growth will sprout from the center of the buds you leave on there not the main steam,
it will grow distorted at first, the leaves will have no serrated edges and grow curled /twisted
each buds puts up many new shoots , you have to thin them out alot to keep it nice and strong
remove the weak spindly growth only keep the thicker shoots that pop out, these shoots will turn into branches new plant / structure if you veg it long enough,
you need about 3-5 weeks to reveg it into a nice shape ready to flower again it will flower a bit quicker the second time round .. and/or you can take cuttings from it once the shoots start growing back normaly without any re-veg distortion