Complex sentence: The Red Sox, who had won the AL wild card, defeated the Anaheim Angels in the American League Division Series to reach the ALCS, while the Yankees, who had won the AL East with the best record in the AL, defeated the Minnesota Twins.
Split into simpler sentences: The Red Sox earned their place in the playoffs by winning the American League wild card, while the Yankees finished first in the American League East with the best record in the American League. In the American League Division Series, the Red Sox defeated the Anaheim Angels, while the Yankees defeated the Minnesota Twins.