Complex sentence: The pair had their first child, a daughter named Margaret "Maggie" Heather Christian, on November 4,2006, named after Martin's sister Heather, who died due to lupus erythematosus at age 19.
Split into simpler sentences: The pair had their first child, a daughter named Margaret "Maggie" Heather Christian, on November 4,2006. She is named after Martin's sister Heather, who died due to lupus erythematosus at age 19.