Once your hair has split the damage is done and will require cutting, so protect it by keeping it supple and moisturized. Use a leave-in conditioner.
Blow drying the hair can damage it so always use a nozzle on your hairdryer concentrating on the hair shaft. If the damage has already been done, a serum applied to split ends will help disguise them and can help protect the hair when applying direct heat such as from curling tongs or heated rollers. The only real solution is to cut the offending ends off.