Complex sentence: George Charles Boldt (25 April 1851--5 December 1916) was a Prussian-born hotelier; a self-made millionaire, who influenced the development of the American urban hotel as a civic social center and luxury destination.
Split into simpler sentences: George Charles Boldt (25 April 1851--5 December 1916) was a Prussian-born American hotelier. A self-made millionaire, he influenced the development of the urban hotel as a civic social center and luxury destination.