Error on concatenating strings in calculated cloumns while creating Analytic Views

Hi

I am facing an issue when I am Concatenating Columns using "+" operator in the Calculated Columns the Final result of the Concatenated String is

for

eg Karthik Karan Joe

the O/P of the Concatenated string is KarthikKaranJoe

instead I want the O/p as Karthik, Karan, Joe or each name in a new line which I am unable to do  any trick to insert a Space Comma or a new line character in the Formula for the Calculated Column A

                                                                                             Thanks in advance

Regards

Rahul