Complex sentence: Collection of Rare Episodes is a BBC three-disc boxset DVD released in 2004--a collection of restored "Doctor Who" episodes and clips from stories that are incomplete or otherwise missing from the Corporation's archives.
Split into simpler sentences: Collection of Rare Episodes is a BBC three-disc boxset DVD released in 2004. It is a collection of restored "Doctor Who" episodes and clips from stories that are incomplete or otherwise missing from the Corporation's archives.