Complex sentence: Tony Bellson died in 2004, and Dee Dee Bellson, at age 49, died July 4,2009, five months after her father, Louis Bellson, who died on Valentine's Day 2009.
Split into simpler sentences: Tony Bellson died in 2004, and Dee Dee Bellson at age 49, died July 4,2009. Five months after her father, Louis Bellson, died on Valentine's Day 2009.