Complex sentence: It is told that Frank Zappa wrote "The Black Page" as a challenge for drummer Terry Bozzio; it was given its name because there were so many black dots on the page of sheet music that it was almost all black.
Split into simpler sentences: It is told that Frank Zappa wrote "The Black Page" as a challenge for drummer Terry Bozzio. It was given its name because there were so many black dots on the page of sheet music that it was almost all black.