Input (grade 11): When Hooper fell into financial difficulties, the Britannica was managed by Sears Roebuck for 18 years (1920 â "23, 1928 â" 43).
Output (grade 10): When Hooper had financial problems, the Britannica was managed by Sears Roebuck for about 18 years (1920 â "1923, 1928 â" 1943).