What will be the new poles of magnet if it is broken

If you break a magnet in two, you end up with two smaller magnets.
The strength of a magnet is related to its size.  So, the two smaller magnets will be weaker than the one original magnet.  However, the relationship may not be linear. So a needle shaped magnet may be weaker than a coin shaped magnet of equal mass.
Thus, the sum of your two broken magnets may in fact be stronger than the original