Complex sentence: Ernest Thompson Willows (1886--1926) was a pioneer Welsh aviator and airship builder the first person in the United Kingdom to hold a pilots certificate for an airship when the Royal Aero Club awarded him "Airship Pilots Certificate No.1".
Split into simpler sentences: Ernest Thompson Willows (1886--1926) was a pioneer Welsh aviator and airship builder. He became the first person in the United Kingdom to hold a pilots certificate for an airship when the Royal Aero Club awarded him "Airship Pilots Certificate No.1".