Complex sentence: The British Chiropractic Association was founded in 1925 and claims to represent over 50% of UK chiropractors claims to be the largest and longest established association for chiropractors in the United Kingdom.
Split into simpler sentences: The British Chiropractic Association was founded in 1925 and claims to represent over 50% of UK chiropractors. It claims to be the largest and longest established association for chiropractors in the United Kingdom.