Original: Mark David McGwire (born October 1, 1963) is a former Major League Baseball player who played his major league career with the Oakland Athletics and the St. Louis Cardinals.
Simplified: Mark David McGwire (born October 1, 1963 in Pomona, California) is a former right-handed First baseman in Major League Baseball who played for the Oakland Athletics (1986–1997) and the St. Louis Cardinals (1997–2001).