Simplify the following text for a Grade 6 native English-speaking person.
Original: The tibia , shinbone , or shankbone is the larger and stronger of the two bones in the leg below the knee in vertebrates ( the other being the fibula ) , and connects the knee with the ankle bones .
Simplified: The tibia , shinbone , or shankbone is the larger and stronger of the two bones in the leg below the knee in vertebrates . It connects the knee with the ankle bones .