Complex sentence: Sir John Ambrose Fleming FRS (29 November 1849--18 April 1945), an English electrical engineer and physicist, is known for inventing the first thermionic valve or vacuum tube.
Split into simpler sentences: Sir John Ambrose Fleming FRS (29 November 1849--18 April 1945) was a British electrical engineer and physicist. He is known for inventing the first thermionic valve or vacuum tube.