Simplify the following text for a Grade 5 native English-speaking person.
Original: Charles Monroe Tesreau was an American Major League Baseball player .
Simplified: Charles Monroe `` Jeff '' Tesreau ( March 5 , 1888 - October 24 , 1946 ) was an American baseball player . Tesreau signed with a Minor League Baseball team of the St. Louis Browns in 1909 .