Complex sentence: American Express investigated Vesuvios restaurant's role in the credit card fraud and pulls the restaurant's authority to accept American Express cards, prompting Artie to figure out Martina as the criminal in his staff, meaning it was Benny's scam.
Split into simpler sentences: American Express investigated Vesuvios restaurant's role in the credit card fraud and pulls the restaurant's authority to accept American Express cards. Artie is able to figure out Martina is the criminal in his staff, meaning it was Benny's scam.