Complex sentence: In the United States, "Super Smash Bros. Melee" was the 19th best-selling video game in 2001 according to the NPD Group, and approximately 4.06 million units have been sold in the country as of December 27,2007.
Split into simpler sentences: In the United States, "Super Smash Bros. Melee" was the 19th best-selling video game in 2001 according to the NPD Group. Approximately 4.06 million units have been sold in the country as of December 27,2007.