Complex sentence: Joseph Medill Patterson (January 6,1879--May 26,1946) was an American journalist and publisher, grandson of publisher Joseph Medill, founder of the "Chicago Tribune" and a mayor of Chicago, Illinois.
Split into simpler sentences: Joseph Medill Patterson (January 6,1879--May 26,1946) was an American journalist and publisher. His grandfather was publisher Joseph Medill, founder of the "Chicago Tribune" and a mayor of Chicago, Illinois.