Extract data from a text file

Hi,
I have got a text file that I need to extract details from.
the text file is in the following format:
 
FirstName SurName (emailaddress)
FirstName SurName (emailaddress)
FirstName SurName (emailaddress)
FirstName SurName (emailaddress)
FirstName SurName (emailaddress)
Etc.
 
Ideally I would like to have the the contents saved to an additional text file in the following format:
FirstName,Surname,EmailAddress
FirstName,Surname,EmailAddress
FirstName,Surname,EmailAddress
Etc.
 
Does anyone know a simple way to do this?
Any help would be great.
 
Thanks very much, Scott.
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