Complex sentence: Frederick George Miles of the Phillips & Powis aircraft company (later Miles Aircraft Ltd) built a test prototype of the Caunter engine and successful tests were carried out at Reading Aerodrome in Woodley, Berkshire, during the late 1930s.
Split into simpler sentences: Frederick George Miles of the Miles Aeroplane Company built a test prototype of the Caunter engine. Successful tests were carried out at Reading Aerodrome during the late 1930s.