Complex sentence: In the descent on Calabria he commanded a detachment of Sir John Stuart's army that captured Damienti, and was commanding engineer in the expedition to the bay of Naples in 1809 ana in the defence of Sicily against Murat (Bunrury, Narrative).
Split into simpler sentences: In the descent on Calabria he commanded a detachment of Sir John Stuart's army that captured Diamante. Bryce was commanding engineer in the expedition to the bay of Naples in 1809 and in the defence of Sicily against Murat (Bunrury, Narrative).