“If the shrub is old, leggy, or overgrown, then severe pruning is recommended, i.e., to cut back the older stems to the ground. It encourages dense and bushy growth of the plant.“
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http://homeguides.sfgate.com/trim-barberry-bushes-35133.html
“If the shrub is old, leggy, or overgrown, then severe pruning is recommended, i.e., to cut back the older stems to the ground. It encourages dense and bushy growth of the plant.“
More great information here
https://gardenerdy.com/barberry-shrub
probably
Yes, I have had success doing it. It enabled me to shape them as they re-create.
https://www.gardenguides.com/114129-care-golden-barberry-plant.html
Rule of thumb in pruning any bush is 1/3 and 1/3. It may survive cutting in half, but it will be in shock and really not look good. Good luck.