If you want an easy way,
use a helper column with the following formula (assuming your data starts in row 1)
this one inserts a Comma, if you wish just remove the comma and keep the space
=RIGHT(N1,FIND(",",N1,1)-2)&", "&LEFT(N1,FIND(",",N1,1)-1)
Then copy and paste the values back into column N or do as you please, maybe keep the helper column.
HTH Coops