Complex sentence: Leaving Lymington on 11 April 1811, she sailed for Canada with a convoy, and on 18 June she left Quebec carrying General Sir James Henry Craig from Canada to England when he was relieved as Governor-General.
Split into simpler sentences: Leaving Lymington on 11 April 1811, she sailed for Canada with a convoy. On 18 June she left Quebec carrying General Sir James Henry Craig from Canada to England when he was relieved as Governor-General.