In what direction do you want to split the letter? If you go on the Z axis its just a matter of duplicating the word and positing them together.
Now if you want to cut the letters on the X axis you have a few ways to do it.
*You can manually cut and join the TEXT spline (I would do this in illustrator) into all the pieces you want and extrude that… this takes time but will give you good results.
*Another would be to Use a boolean object, cutting the letters that way but you will most likely get some unwanted artifacts.
/Randy