Complex sentence: After his military commitment, he re-joined the Red Sox organization, and began the season with their parent club, making his major league debut on April 26,1956 in a one-inning relief appearance against the New York Yankees.
Split into simpler sentences: After his military commitment, he re-joined the organization, and began the season with the Red Sox. He made his major league debut on April 26,1956, a one-inning relief appearance against the New York Yankees.