Complex sentence: This is their first album featuring Ronnie James Dio, and first with producer Martin Birch.The album is the first real metal album of the band it is truly heavy and had big success worldwide by selling 4 million copies.
Split into simpler sentences: This is their first album featuring Ronnie James Dio, and first with producer Martin Birch.The album is the first real metal album of the band. It is truly heavy and had big success worldwide by selling 4 million copies.