Complex sentence: Later that year on April 3,2010, the iPad was launched in the US and sold more than 300,000 units on that day, reaching 500,000 by the end of the first week.
Split into simpler sentences: Later that year on April 3,2010, the iPad was launched in the US. It sold more than 300,000 units on its first day, and 500,000 by the end of the first week.