Translation of Zusatzversicherung

In May I'll be able to show the machine at an exhibition in the university. In addition, we can show it to all these university partner laboratories in the U.S., which are led by people who live here.
Therefore we use only the Vocabulix dictionary in our class. It has good features and a large vocabulary base. I will have to send you a few sentences for rewriting if that is OK with you, because the whole is mixed up.
Besides, what do you do for living? Where exactly do you live in Venezuela? Southern Germany is also very beautiful with the Alps. Can you understand my German? I would like to improve it.