Complex sentence: During the 1951 and 1952 seasons, Doll was selected to appear in his second and third Pro Bowls and received the George S. Halas Trophy as the Most Valuable Player in the 1953 Pro Bowl.
Split into simpler sentences: During the 1951 and 1952 seasons, Doll was selected to appear in his second and third Pro Bowls. He received the George S. Halas Trophy as the Most Valuable Player in the 1953 Pro Bowl.