Simple grammar, take two

Hi! I thought about my simple grammar that I posted a while back and all of your comments and I've
now made a new attempt at an easy to use and relatively fast to learn grammar.
This time, there are two grammar rules:
1. x y z. => x is in class y which is in class z.
2. w si x si y na z. => w and x and y are in class z.
Here are a few example sentences using English words (except for na and si, of course):
man patient si dog na bite.
A man who is in class patient and a dog are in class bite.
A dog bites a man.
picture si word plural thousand patient na say.
A picture and a word that is in class plural which is in class thousand which is
in class patient are in
class say.
A picture says much more than a thousand words.
What do you think? Any comments or suggestions?
Cheers,
Yann Kiraly