Summarize and humanize this content to 2000 words in 6 paragraphs in EnglishJean Marsh, the Emmy award-winning actor who co-created and acted in the ’70s British drama series “Upstairs, Downstairs,” died Sunday in her London home. She was 90. Marsh’s death was confirmed by The New York Times, with the cause being complications of dementia, according to filmmaker and close friend Michael Lindsay-Hogg. Marsh co-created “Upstairs, Downstairs” […]