Original sentence: , but her husband Esmond volunteered for the RAF and was killed during an air raid.In the early 1980s, Deborah also became politically active  when she and her husband, the Duke of Devonshire, became leading lights in the newly formed political party, the SDP
Edited sentence: , but her husband Esmond volunteered for the RCAF and died when his bomber developed mechanical problems over the North Sea.In the early 1980s, Deborah also became politically active when she and her husband, the Duke of Devonshire, became leading lights in the newly formed political party, the SDP