Complex sentence: Robin George Collingwood (22 February 1889--9 January 1943) was an English philosopher, historian, and archaeologist, best known for his posthumously-published book "The Idea of History" (1946).
Split into simpler sentences: Robin George Collingwood (22 February 1889--9 January 1943) was an English philosopher, historian, and archaeologist. He is best known for his posthumous book "The Idea of History" (1946).