Original sentence: The book Kindred Spirits: Harvard Business School's Extraordinary Class of 1949 and How they Transformed American Business by David Callahan focuses on the "legendary" Harvard MBA class of 1949 which it claims transformed business in America during the 1950's
Edited sentence: The book Kindred Spirits: Harvard Business School's Extraordinary Class of 1949 and How they Transformed American Business by David Callahan focuses on the "legendary" Harvard MBA class of 1949 which it claims transformed business in America during the 1950s