Simplify the following text for a Grade 6 native English-speaking person.
Original: As part of Nissan Skyline 's 50th anniversary , Warner Music Japan published a CD titled SKYLINE 50th ANNIVERSARY CD , featuring music from Nissan Skyline commercials . Skyline model cars had also been produced .
Simplified: The Nissan Skyline is a model of Nissan produced since 1958 .