Simplify the following text for a Grade 14 native English-speaking person.
Original: His most famous compositions are his six published books of madrigals ( between 1594 and 1611 ) , as well as his Tenebrae Responsoria , which are very much like madrigals , except that they use texts from the Passion , a form ( Tenebrae ) used by many other composers .
Simplified: His most famous compositions are his six published books of madrigals ( between 1594 and 1611 ) , as well as his Tenebrae Responsories , which are very much like madrigals , except that they use texts from the Passion story about Christâ s death on the cross .