Making code more readable, iterating over inner map [closed]

Question

So currently I looking for some hints from more experienced programmers. I am in the point where, when looking into my code it seems not readable, what is probably big flaw. So lets go to the code itself:

In one the classes I have method:

    protected void createModelsCharacterisitcListGroup(Map<CharacterType, Map<String, String>> characters) {

        for (Entry<CharacterType, Map<String, String>> outterEntry : characters.entrySet()) {
            for (Entry<String, String> innerEntry : outterEntry.getValue().entrySet()) {
                outterEntry.getKey().create(characters.get(outterEntry.getKey()).get(innerEntry.getKey()), source.getStringified(innerEntry.getKey()));
            }
        }

}

And CharacterType is the enum like this:

public enum CharacteristicType {
    TYPE1 {

        @Override
        public void create(String name, String value){

        }
    },
    TYPE2{

        @Override
        public void create(String name, String value) {

        }
    };

    public abstract void create(String name, String value);
}

So what I want to do is:

Call method create for given CharacterType in Map with Strings from inner map

Answer 1

Using temporary variables can help a lot (note I'm not a Java programmer, so syntax might be wrong):

for (Entry<CharacterType, Map<String, String>> outterEntry : characters.entrySet()) {
    for (Entry<String, String> innerEntry : outterEntry.getValue().entrySet()) {
        var arg1 = characters.get(outterEntry.getKey()).get(innerEntry.getKey());
        var arg2 = source.getStringified(innerEntry.getKey());
        outterEntry.getKey().create(arg1, arg2);
    }
}

arg1 and arg2 should be given meaningful names, of course. The expression assigned to arg1 looks still fairly unreadable, which might be due to both its length and the generic method names get() and getKey() which convey technical function but not meaning.