Another way:
hello, how, are, you 'cell A1
=MID(A1;1;FIND(",";A1)-1) 'hello
=MID(A1;FIND(",";A1)+2;(FIND(",";A1;FIND(",";A1)+2))-(FIND(",";A1)+2)) 'how
=MID(A1;(FIND(",";A1;FIND(",";A1)+2))+2;FIND(",";A1;((FIND(",";A1;FIND(",";A1)+2))+2))-((FIND(",";A1;FIND(",";A1)+2))+2)) 'are
=MID(A1;FIND(",";A1;((FIND(",";A1;FIND(",";A1)+2))+2))+2;FIND(",";A1;((FIND(",";A1;FIND(",";A1)+2))+2))-((FIND(",";A1;FIND(",";A1)+2))+2)) 'you
This is not a good solution. Easier with "Text to function" in Data menu, using Delimited and Other set to ",".