Complex sentence: However, with a diet of cereal and raw meat, and a controlled exercise plan, Endal qualified as a fully operational assistance dog and became the service dog for disabled ex-Royal Navy Chief Petty Officer Allen Parton in 1997.
Split into simpler sentences: However, with the help of a specialized diet and controlled exercise, Endal qualified as a fully operational assistance dog. He became the service dog for disabled ex-Royal Navy Chief Petty Officer Allen Parton in 1997.