Complex sentence: Eight ships of the Royal Navy have been named HMS "Beagle", after the beagle (a type of dog), although all are obscure except for the second "Beagle", 1820-1870, that transported Charles Darwin around the world.
Split into simpler sentences: Eight ships of the Royal Navy have been named HMS "Beagle", after the beagle (a type of dog). All are obscure except for the second "Beagle", 1820--1870, that transported Charles Darwin around the world.