Complex sentence: The ENDS Report was edited from 1981 to 1997 by Marek Mayer, who was Editorial Director from 1997 until his death in 2005 from a rare form of kidney cancer.
Split into simpler sentences: The ENDS Report was edited from 1981 to 1997 by Marek Meyer, who was Editorial Director from 1997 to 2005. He died in 2005 from a rare form of kidney cancer.