You can break them off when they are about half the size of the mother and repot them.

Do not over-pot these bromeliads. Use a shallow pot just a bit larger than the existing root ball.
The potting mix should be well draining but still retain some moisture. These bromeliads
especially do not want wet feet in the winter because this can lead to rot. During winter, water
plants early in the day. Not only can watering late lead to wet feet and rot, Steens warns
against "cold burn" from wet leaves during low temperatures. During our hot summer months,
do not water during the heat of the day as this also can burn the leaves; watering early to mid
morning is best. If your water is hard, alkaline or salty, consider flushing your Guzmanias with
rainwater or bottled water. If you want to fertilize this bromeliad, use a low strength
solution once a month during the warm growing seasons and not during the winter when the
Guzmania rests. When grown indoors as a houseplant, mist two to three times a week.
Guzmanias like light shade to semi-shade conditions. While
Guzmania species do not tolerate cold well, the hybrids are a bit hardier. Its best to protect
Guzmanias from cold temperatures, cold wind and frost, which will damage the leaves.

The original rosette will not rebloom, but the pups it produces will each bloom when they are mature. It is up to you whether you want to to remove them and pot them seperately or leave the clump together. You'll get plants with better form (and more subsequent pups) if you divide them, but they'll grow and bloom if you leave them together too, and it may be less stressful on them at this time of year. If you do that, just remove all the brown leaves on the mother plant as they form, until it eventually disappears and all you have left is the group of pups, which should be mature by then. A slightly bigger pot may be in order too.