Complex sentence: According to Penrose the first general arrangement was by John Digby (teh chief stressman) which was a similar to the Westland P76 with the pilot in an enclosed cokpit inf fron the the centre section and a retracting undercarriage.
Split into simpler sentences: According to Penrose the first general arrangement was by John Digby (The chief stressman). It was similar to the Westland P7 with the pilot in an enclosed cockpit in front of the center section and a retracting undercarriage.