Complex sentence: Héctor Germán Oesterheld (born July 23,1919; disappeared and presumed dead 1977), also known as his common abbreviation HGO, was an Argentine journalist and writer of graphic novels and comics who has come to be celebrated as a master in his field.
Split into simpler sentences: Héctor Germán Oesterheld (born July 23,1919; disappeared and presumed dead 1977), also known as his common abbreviation HGO, was an Argentine journalist and writer of graphic novels and comics. He has come to be celebrated as a master in his field.