Original sentence: Indian Institute of Management Ahmedabad (IIM Ahmedabad, also known as IIMA), was the second Indian Institutes of Management to be established in India after IIM Calcutta.It is the premier institute of management education in India and is widely considered to be one of the toughest to get in MBA programs in the world.It was established in 1961 as an autonomous institution by the Government of India in collaboration with the Government of Gujarat and Indian Industry
Edited sentence: IIM Ahmedabad, also known as IIMA, was the second of the string of IIMs to be established in India after IIM Calcutta.It is the premier institute of management  education in India and is widely considered to be one of the toughest to get in MBA programs in the world.It was established in 1961 as an autonomous institution by the Government of India in collaboration with the Government of Gujarat and the Indian Industry