Complex sentence: In 2002, Martin independently released a limited edition EP containing eight tracks called "Test-Drive Songs", which is now out of print but still available for download at digital outlets including Martin's official site.
Split into simpler sentences: In 2002, "Test-Drive Songs", a limited edition EP containing eight tracks, was released independently. The hard copy is out of print but it is still available for download at digital outlets, including Martin's official site.