Simplify the following text for a Grade 7 native English-speaking person.
Original: There is hyaline cartilage present in the bronchi , present as irregular rings in the larger bronchi ( and not as regular as in the trachea ) , and as small plates and islands in the smaller bronchi .
Simplified: The bronchi have cartilage as part of their supporting wall structure . The trachea divides to form the right and left main bronchi .