Question Methods

Hello, I was wondering if someone could tell me how to make something like "a method in a method"

Like:
I make my API/Library and i do

Code:

public class ClassName extends ApiName {

ApiName api;

public void MyMethod() {
    api = new ApiName();
    api.getPlugin().getDescription();
}

}

How would i make that getPlugin().getDescription()?

Bye and thanks