Complex sentence: Thomas Henry Timmermann (born May 12,1940) is a former Major League Baseball pitcher who played for six seasons with the Detroit Tigers (1969--1973) and Cleveland Indians (1973--1974).
Split into simpler sentences: Thomas Henry Timmermann (born May 12,1940) is a former American baseball player. He played professional baseball for 15 years from 1960 to 1974, including six seasons in Major League Baseball as a pitcher for the Detroit Tigers (1969--1973) and Cleveland Indians (1973--1974).