How to combine 2 fields into 1 using Conditions?

I want the system to automatically create an e-mail for the auto-responder using 2 fields: The last name and the student ID  with the ending @reinhardt.edu 

I thoroughly tested the Full Name Field but failed to separate the first and last name fields within Conditions. The only way around this is to use 2 Textbox (Short Text Entry) fields - One for the first name and another for the last name. Then, use the UPDATE/CALCULATE FIELD Condition to concatenate them all.

Logic:

IF First Name, Last Name AND Student ID Number are FILLED OUT

THEN INSERT Last Name + Student ID Number + @students.reinhardt.edu to the Reinhardt E-mail field

Result: https://www.jotform.com/71655675834973 (this is a simplified clone of your form)

Complete guide: How-to-Manipulate-Text-String-with-Conditions-and-Calculation 

Afterwards, just set the Reinhardt E-mail field as the recipient for your Autoresponder Email.

Related guide: Creating-a-Form-Autoresponder