Prevention is usually better than treatment. If you use heated hair tools, always use heat protection and remember to give your hair a break every so often. Using a repairing, moisturising shampoo and conditioner will help and a weekly conditioning treatment. There are also some natural remedies you can find online to help hair without worrying about he chemicals that go into hair products.
Your diet also affects the health of your hair, having a healthy diet will keep hair strong, shiny and help it grow.
The link below will take you to an article which advises on both preventing and removing split ends.
http://m.wikihow.com/Remove-and-Prevent-Split-Ends