Complex sentence: The National Association of State Boards of Accountancy (NASBA) is an umbrella group for the 55 state boards that regulate the accountancy profession in the United States of America.
Split into simpler sentences: The National Association of State Boards of Accountancy (NASBA) is an association dedicated to serving the 55 state boards of accountancy. These are the boards that regulate the accountancy profession in the United States of America.