Hussain,
You could use the split variable assertion to convert the response into a multi part context variable which then could be used in Run Assertion For Each Item assertion branch to build out a context variable. The Run Assertion will really only be required if there are multiple lines. If it is a fixed number of entries on one line then you can use the set context variable to build the template with the array values of the split variable.
Additional understanding points
Example in the FTP file: cat,tree,one,12345
Split variable will create an array in a variable: Variable name: foo Array values foo[0]=cat / foo[1]=tree / foo[2]=one, ....
In the set context variable create the template:
<output>
<animal>${foo[0]}</animal>
<location>${foo[1]}</location>
<numberFiremen>${foo[2]}</numberFiremen>
</output>
Sincerely,
Stephen Hughes
Director, CA Support