Complex sentence: A large number of breeds are susceptible to hip dysplasia; in a survey conducted by Orthopedic Foundation for Animals, the American Cocker Spaniel was ranked 115th worst affected out of 150 different breeds; the English Cocker was ranked 129th.
Split into simpler sentences: A large number of breeds are susceptible to hip dysplasia. In a survey conducted by Orthopedic Foundation for Animals, the American Cocker Spaniel was ranked 115th worst affected out of 150 different breeds; the English Cocker was ranked 129th.