Complex sentence: The operation consisted of the landing by sea of the British 13th Corps of the British 8th Army at Reggio di Calabria, which included British and Canadian troops and was led by General Bernard Montgomery.
Split into simpler sentences: The operation consisted of the landing by sea of the British XIII Corps at Reggio di Calabria. XIII Coorps, which included British and Canadian troops, was part of the British 8th Army led by General Bernard Montgomery.