Complex sentence: Primarily a relief pitcher, Littell served at the Royals' closer in 1976-1977, and is best remembered for giving up a walk-off home run to New York Yankees first baseman Chris Chambliss to end the 1976 American League Championship Series.
Split into simpler sentences: Primarily a relief pitcher, Littell served at the Royals' closer in 1976-1977. Littell is remembered for giving up a walk-off home run to New York Yankees first baseman Chris Chambliss to end the 1976 American League Championship Series.