Simplify the following text for a Grade 8 native English-speaking person.
Original: Denver Clayton Lemaster ( born ( February 25 , 1939 in Corona , California ) was a Major League Baseball pitcher from 1962 to 1972 for the Milwaukee Braves , Atlanta Braves , Houston Astros , and Montreal Expos .
Simplified: Denver Clayton Lemaster ( born February 25 , 1939 in Corona , California ) was a Major League Baseball pitcher . He began his career when he was signed by the Milwaukee Braves .