Extensive Form Representation
Imagine you're Player 2. What different "scenarios" could you find yourself in?


If Player 1 chooses Right, then Player 2 could observe if Nature played Up or Down. So you have 2 information sets there.
If Player 1 chooses Left, then Player 2 couldn't differentiate between (Up, Left) and (Down, Left). How many information sets should there be here?


So in total, you should have how many information sets? You currently have 4. Which one should you "combine"?