You can create a service connector from a WSDL file with nested and repeating elements.
For example, consider the following WSDL and WSDL schema files with the nested, repeating elements 'shelf' and 'book':
You can use this WSDL and WSDL schema file to create a service connector using the WSDL to Service Connector tool. When you import the service connector, you see three process objects: Library, Shelf, and Book. When you select a parent object, you also see the nested object in the right side of the bottom panel.