Complex sentence: Commander James Spratt (1771--1853), RN was a hero of the Battle of Trafalgar and father of Thomas Abel Brimage Spratt, English vice-admiral, hydrographer and geologist.
Split into simpler sentences: Commander James Spratt (1771--1853), was an officer in the Royal Navy and became known as one of the heroes of the Battle of Trafalgar. Spratt was also the father of Thomas Abel Brimage Spratt, English vice-admiral, hydrographer and geologist.