Complex sentence: Sir Hiram Stevens Maxim (February 5,1840--November 24,1916) was an American inventor who emigrated to the United Kingdom at the age of 41, although he remained an American citizen until he became a naturalized British subject in 1900.
Split into simpler sentences: Sir Hiram Stevens Maxim (February 5,1840--November 24,1916) was an American inventor who moved to the United Kingdom at the age of 41. He remained an American citizen until he became a naturalized British subject in 1900.