Complex sentence: On her fourth convict voyage, under the command of Benjamin Freeman and surgeon John Gannon, she left Torbay, England on 4 August 1836, with 280 male convicts.
Split into simpler sentences: On her fourth convict voyage she under the command of Benjamin Freeman, and her surgeon was John Gannon. She left Torbay, England, on 4 August 1836, with 280 male convicts.