Answer:
Disappointed by his performance, Harry left the room.
Explanation:
Since the function of the comma is to show where there is a slight break or pause in the sentence, it is used as shown.
Move the plot:
Flat characters—minor figures that play a supporting role in the story—are used to move the plot along, providing subtle exposition. Such characters do not undergo substantial change or growth in the course of a story. They are also known as "two-dimensional characters" or "static characters."
It is a COMPOUND SENTENCE as it is made up of two independent clause (a clause has a subject an a predicate and it does not need the other clause in order to convey meaning). This independent clauses are joined by the coordinating conjuction “and”.
