Complex sentence: GCSI, (April 6,1801--October 16,1885), British field-marshal, third son of the Right Hon. Sir George Henry Rose of Sandhills, Christchurch, Hampshire (minister plenipotentiary at the Prussian court), was born at Berlin.
Split into simpler sentences: GCSI, (April 6,1801--October 16,1885) was a British Army field-marshal. He was the third son of the Right Hon. Sir George Henry Rose of Sandhills, Christchurch, Hampshire (minister plenipotentiary at the Prussian court) and was born at Berlin.