Here are some tips for you.
http://www.wikihow.com/Remove-Split-Ends
http://findarticles.com/p/articles/mi_m0846/is_3_23/ai_108836436
http://beauty.ivillage.com/hair/hairfaq/0,,7q3t6w1x,00.html
I know, i know, you probably didn't expect a guy to answer this, but I once had long hair and suffered from the same problem. :)
Good luck and best wishes.
