Simplify the following text for a Grade 6 native English-speaking person.
Original: Thus , as exceptional cases one finds brass instruments made of wood like the alphorn , the cornett , the serpent and the didgeridoo , while some woodwind instruments are made of brass , like the saxophone .
Simplified: Some brass instruments are really made of wood , but are still called brass instruments , like the serpent . Other instruments are made of brass but do not work like this , like the saxophone .