Complex sentence: According to Allmusic's Steve Huey, "Black Sabbath" marks the beginning of heavy metal music as it is known to most listeners and that it "transcends its clear roots in blues-rock and psychedelia to become something more".
Split into simpler sentences: According to Allmusic's Steve Huey, "Black Sabbath" marks "the birth of heavy metal as we now know it". In his opinion, the album "transcends its clear roots in blues-rock and psychedelia to become something more".