Complex sentence: Wellington takes its name from Arthur Wellesley (1769-1852), the first Duke of Wellington and victor of the Battle of Waterloo (1815): his title comes from the town of Wellington in the English county of Somerset.
Split into simpler sentences: Wellington takes its name after Arthur Wellesley (1769-1852), the first Duke of Wellington and victor of the Battle of Waterloo (1815). The Duke's title comes from the town of Wellington in the English county of Somerset.