Complex sentence: Grizel was the daughter of Charles, 9th Lord Elphinstone, and thus an aunt to several eminent imperial officials, including the admiral George Elphinstone, 1st Viscount Keith and colonial administrator Mountstuart Elphinstone, the Governor of Bombay.
Split into simpler sentences: Grizel was the daughter of Charles, 9th Lord Elphinstone. She was also an aunt to several eminent imperial officials, including the admiral George Elphinstone, 1st Viscount Keith and colonial administrator Mountstuart Elphinstone, the Governor of Bombay.