Complex sentence: Little is known of Murray's life on the continent, he returned to Scotland in 1724 when the duke of Atholl died, and was succeeded in his title by his second son, James, owing to the attainder of Tullibardine.
Split into simpler sentences: Little is known of Murray's life on the continent. He returned to Scotland in 1724 when the duke of Atholl died, and was succeeded in his title by his second son, James, owing to the attainder of Tullibardine.