Hi, Marie,
as I understand, this first survey is an open survey.
You have name and email only within the data fields of the survey, in this question of type "long text".
For your follow up survey, which should be a closed one with tokens (but not anonymous), you have to create a participant table.
1. You export the survey to EXCEL.
2.a. Either You type the information of the text field into a different sheet.
2.b. Or you may try to extract the parts by an EXCEL macro. (Probably difficult, because the data have to be in the same structure)
3. Read the chapter in the manual about uploading participants data from *.csv
www.limesurvey.org/manual/Survey_partici...ants_from_a_CSV_file
4. Add an attribute, where you enter the ID of the answer table.
www.limesurvey.org/manual/Survey_participants#Manage_attributes
5. Save your data (mandatory "firstname", "lastname", "email" and the attribute "attribute_1") as *.csv
6. Import into your follow up survey.
7. Send invitations
And because each participant has as attribute the answer ID of the first survey you may merge them.
Joffm
With Tammo: If you use the email address to merge the surveys you do not need the attribute.