Excel Formula add SUBSTITUTE(B1;" "."") to formula from splitting displayname

hi,

In Cell "G2" i have this formula

=TRIM(MID(C2,FIND(",",C2,1)+1,IFERROR(FIND("(",C2,1)-FIND(",",C2,1)-1,LEN(C2)))))

C2 is:  Jones, Mike

The result in G2 is  "Mike"   Firstname

in Cell "H2" i have this formula

=MID(C2,1,(SEARCH(",",C2))-1))

The result in H2 is  "Jones"   Lastname

so far so good but how can replace spaces or - or with "." when the displayname looks like that:

Jones-ryan, Mike Michael         Result G2 should be mike.michael and H2 jones.ryan
Jones ryan, Michael Mike         Result G2 michael.mike and H2 jones.ryan
Jones, Dimitri Jack Michael      Result G2 dimitri.jack.michael and H2 jones

The last one is different
Jones, Michael Jack (12345)      Result G2 michael.jack and H2 jones.12345

I tried different formula with =SUBSTITUTE(G2;" ";"") but still not working

Could anyone assist how to solve that, please?

Any help would be greatly appreciated.
Mandy