Simplify the following text for a Grade 6 native English-speaking person.
Original: A bridge is a device for supporting the strings on a stringed instrument and transmitting the vibration of those strings to some other structural component of the instrument in order to transfer the sound to the surrounding air .
Simplified: A bridge on a string instrument is something that stands on the body of the instrument and supports the strings . It sends the vibrations of the strings to the main part of the instrument so that the sound can be heard .