Complex sentence: Betty and her friends entertain the customers with a Hawaiian hula revue, the trio are seen entertaining the customers by Diner Dan who owns the diner, he gets very angry and fires Betty and her friends.
Split into simpler sentences: Betty and her friends entertain the customers with a Hawaiian hula revue. The trio are seen entertaining the customers by Diner Dan who owns the diner, he gets very angry and fires Betty and her friends.