Complex sentence: They lived in Fitzwilliam Square and produced four sons, the eldest son and heir being William Gibson, 2nd Baron Ashbourne, and four daughters-one of whom, Violet Gibson made an attempt to assassinate Benito Mussolini in 1926.
Split into simpler sentences: They lived in Fitzwilliam Square and produced four sons, the eldest son and heir being William Gibson, 2nd Baron Ashbourne, and four daughters. One of their daughters, Violet Gibson made an attempt to assassinate Benito Mussolini in 1926.