Complex sentence: In each round, Fieri issues a challenge to the chefs and they have a set length of time (usually 30 minutes) to collect ingredients from the market, using shopping carts, and prepare and plate their dishes.
Split into simpler sentences: In each round, Fieri assigns a dish and issues a challenge to the chefs. They then have a set length of time (usually 30 minutes) to collect ingredients from the market, using shopping carts, and prepare and plate their dishes.