ok heres a basic 3 hit combo

you just have to add::

trigger2 = stateno =
trigger2 = movecontact

after each command.

You cant put that under the first attack only the attack that comes after it.
After where it says "stateno = " put the command state the comes before it

here what it should look like after::
;---------------------------------------------------------------------------
; Stand Light Punch
[State -1, Stand Light Punch]
type = ChangeState
value = 200
triggerall = command = "x"
triggerall = command != "holddown"
trigger1 = statetype = S
trigger1 = ctrl

;---------------------------------------------------------------------------
; Stand Medium Punch
[State -1, Stand Medium Punch]
type = ChangeState
value = 210
triggerall = command = "x"
triggerall = command != "holddown"
trigger1 = statetype = S
trigger1 = ctrl
trigger2 = stateno = 200
trigger2 = movecontact

;---------------------------------------------------------------------------
; Stand Strong Punch
[State -1, Stand Strong Punch]
type = ChangeState
value = 220
triggerall = command = "x"
triggerall = command != "holddown"
trigger1 = statetype = S
trigger1 = ctrl
trigger2 = stateno = 210
trigger2 = movecontact