Original sentence: In 2006, the CCRP created the Mathieson Forum to honor the memory of Graham Mathieson, a Fellow of the UK MOD's Defence Science and Technology Laboratory, who died unexpectedly earlier that year
Edited sentence: In 2006, the CCRP created the Mathieson Forum to honor the memory of Graham Mathieson, a Fellow of the UK MOD's Defence Science and Technology Laboratory, who passed away unexpectedly earlier that year