Complex sentence: The series has been critically acclaimed and commercially successful, having shipped more than 250 million units, making it the fourth-highest selling video game franchise of all time, behind Nintendo's "Mario" and "Pokémon" franchises, and "Tetris".
Split into simpler sentences: The series has been critically acclaimed and commercially successful, having shipped more than 250 million units, making it the fourth-highest selling video game franchise of all time. It's behind Nintendo's "Mario" and "Pokémon" franchises, and "Tetris".