Conditional flow expression forms usability

Conditional flows provides two options to create condition expressions. On the one hand users can specify a simple expression language in a text field and on the other hand the user is able to use the basic expression builder form fields to create expressions.

We need to find a better solution for displaying those form fields so the user is able to use both ways of specifying a condition expression. At the moment all fields are displayed and the user is confused which of those fields to use (See screenshot)

Maybe use tabs or a switch component to jump from advanced expression language to basic expression builder and vice versa.