Complex sentence: On 31 October, 1796, Boyle was commissioned Captain of five different units, those of Castlemartyr, Cloyne, Cove, Imokilly and Middleton.
Split into simpler sentences: On 31 October, 1796, Boyle was commissioned Captain of five different units. Specifically those of Castlemartyr, Cloyne, Cove, Imokilly and Middleton.