Complex sentence: The most noteworthy of these fighting Cochranes was Thomas Cochrane, 10th Earl of Dundonald (1775-1860) who joined the Royal Navy at the age of 18.
Split into simpler sentences: The most noteworthy of these fighting Cochranes was Thomas Cochrane, 10th Earl of Dundonald. Most notably Thomas Cochrane (1775-1860) the 10th Earl of Dundonald who joined the Royal Navy at the age of 18.