Something

function test(string MSG2)
{
declare var1 string local 
declare var2 string local
;now you got var 1 with the 2nd part of your split so big-cheese var1 now is cheese
var1:Set[${MSG2.Token[2,"-"]}]
echo "${var1}"
;should say cheese...get it back to your source
return ${var1}
}
;now source
if ${Return.Equal[cheese]}
echo "where the fuk are my fries?"