Complex sentence: An existential graph is a type of diagrammatic or visual notation for logical expressions, invented by Charles Sanders Peirce, who wrote his first paper on graphical logic in 1882 and continued to develop the method until his death in 1914.
Split into simpler sentences: An existential graph is a type of diagrammatic or visual notation for logical expressions, invented by Charles Sanders Peirce. Peirce wrote his first paper on graphical logic in 1882, and continued to develop the method until his death in 1914.