Complex sentence: His father was the Duke of Kent, the fourth-eldest son of George V and Queen Mary, who was killed in a plane crash near Caithness, Scotland on 25 August 1942, just six weeks after his son was born.
Split into simpler sentences: His father was the Duke of Kent, the fourth-eldest son of George V and Queen Mary. The Duke of Kent was killed in a plane crash near Caithness, Scotland on 25 August 1942, just six weeks after his son was born.