Complex sentence: After co-operating with Sir David Baird in the occupation of the Cape of Good Hope, in June 1806, he led the British invasions of the Río de la Plata on Buenos Aires by General Beresford's brigade of 1500 men with his squadron.
Split into simpler sentences: After co-operating with Sir David Baird in the occupation of the Cape of Good Hope. In June 1806, he led the attempt on Buenos Aires by General Beresford's briagde of 1500 men with his squadron.