Complex sentence: The album is best known for the opening track, "Fast As A Shark", with its blazingly fast double bass drumming recognized today as a new level in the development of the subgenre of speed metal.
Split into simpler sentences: The album is best known for the opening track, "Fast As A Shark". Its blazingly fast double bass drumming is recognized today as reaching a new level in the development of the subgenre of speed metal.