Complex sentence: Anne Blight, founder of the Starfish Project, has been working for and with people who stammer for many years, first as an active volunteer with the original Association for Stammerers, then with its successor organisation The British Stammering Association.
Split into simpler sentences: Anne Blight, founder of the Starfish Project, has been working for and with people who stammer for many years. First as an active volunteer with the original Association for Stammerers, then with it's successor organisation The British Stammering Association.