Complex sentence: On her third convict voyage, under the command of Henry Ager and surgeon George Birnie, she left Cork, Ireland on 6 August 1831, with 217 male convicts.
Split into simpler sentences: On her third convict voyage, she was under the command of Henry Ager and her surgeon was George Birnie. She left Cork, Ireland, on 6 August 1831, with 217 male convicts.