Here is my first tree for the sentence in Eternity’s topic.
The latter was a normal state; creatures of Lummox’s breed were always ready for a little snack, even after a full meal.
I have ‘were’ as the parent of ‘even’, and the prepositional phrase ‘after a full meal’ as the child of ‘even’.
I am fairly confident ‘were’ is the parent of ‘even’. I think ‘even’ is an adverb modifying the whole clause lead by ‘were’, and it is being used in the following highlighted sense:
I am not very confident in the placement of the prepositional phrase. Another option that seems plausible to me is that its parent is ‘ready’, and another option is that it is a child of ‘were’.
Edit: The colour code I’ve used is the same Elliot has used e.g here. Also I made a mistake colour coding my tree and the semi-colon should be coloured red.