The cause of splits ends is that as your hair grows, the natural oils from the scalp fail to reach the shaft. This makes the ends of the hair more vulnerable to breakage. The first possibility is that your hair has had long sun exposure. Shampooing your hair and not conditioning does not help restore the essential oils. Not restoring the hair's essential oils can result in dry and brittle ends which are prone to splitting. Secondly not trimming your hair regularly will aggravate the condition. Lastly chemical processes done in excess such as relaxers, perms, or permanent colors can damage and dry your hair. Also poor quality brushes and combs can also cause this problem.

HOW TO FIX IT:
Go for deep conditioning treatment once a week, Conditioning is mandatory every time you have a chemical process done. Trim your ends regularly(every 3 months). Shampoo your hair after a workout or strenuous exercise. The salt from perspiration will erode your hair. Prevention and maintenance is key to keeping your hair long and healthy.