Simplify the following text for a Grade 5 native English-speaking person.
Original: He played the Delta Blues and is known for teaching Charlie Patton to play the blues , and moved to Chicago after World War I.
Simplified: Very little is known for certain about his life , other than he tutored Charlie Patton in the ways of the blues . There have been suggestions that he moved to Chicago shortly after World War I. There are no recordings of him .