Complex sentence: Derryl Cousins (born August 18,1946) is a former umpire in Major League Baseball (MLB), who worked in the American League (AL) from 1979 to 1999, and umpired throughout both leagues from 2000 until his retirement following the 2012 season.
Split into simpler sentences: Derryl Cousins (born August 18,1946) is a former umpire in Major League Baseball (MLB). He worked in the American League (AL) from 1979 to 1999, and umpired throughout both leagues from 2000 until his retirement following the 2012 season.