Complex sentence: The Kid Vid system consisted of a separate voice module (sold separately) that was required for game play; without the Kid Vid module and the three Sound Story cassettes (sold with the game cartridge), game play was not possible.
Split into simpler sentences: The Kid Vid system consisted of a separate voice module (sold separately) that was required for game play. Without the Kid Vid module and the three Sound Story cassettes (sold with the game cartridge), game play was not possible.