I will greatly multiply your pain
"I will make your pain increase much" or "I will make your pain to be very severe"
in having children
"in giving birth to children" or "when you give birth to children"
Your desire will be for your husband
"You will have a strong desire for your husband." Possible meanings are 1) "You will want very much to be with your husband" or 2) "You will want to control your husband"
he will rule over you
"he will be your master" or "he will control you"