Complex sentence: Edwin David Mayer (born November 30,1931 in San Francisco, California, USA) was a left-handed Major League Baseball relief pitcher who played for the Chicago Cubs in 1957 and 1958.
Split into simpler sentences: Edwin David Mayer (born November 30,1931 in San Francisco, California, USA) is a former professional baseball pitcher. A left-handed relief pitcher, Mayer played parts of two seasons in Major League Baseball for the Chicago Cubs in 1957 and 1958.