Complex sentence: Their mainstream success continued with their self-titled album in 2003; however, sales were lackluster compared to "White Pony", and in 2004 Maverick Records ushered Deftones to work on a follow up.
Split into simpler sentences: Their mainstream success continued with their self-titled album in 2003. However, sales were lackluster compared to "White Pony", and in 2004 Maverick Records ushered Deftones to work on a follow up.