Complex sentence: The album sold 800,000 in its second week, 598,000 in its third week, and 519,000 in its fourth week for a four week total of 3.65 million, and became one of few albums to sell over half a million copies for four consecutive weeks.
Split into simpler sentences: The album sold 800,000 in its second week, 598,000 in its third week, and 519,000 copies in its fourth week for a four week total of 3.65 million. It also became one of the few albums to sell over half a million copies for four consecutive weeks.