- I ate the sushi and left the restaurant.
- The answer Simple Sentence is correct.
- This is a simple sentence. It is easy to see, however, why someone might think that this is a compound sentence, since it contains the co-ordinating conjunction "and"; however, the conjunction actually joins two predicates -- "ate the sushi" and "left the restaurant" -- within a single clause. The clue that you are dealing with a compound predicate rather than a compound subject is the fact that there is only one subject, "I."