original: He traveled over 200,000 miles, an incredible achievement for pre-aviation times.
simplifications: He traveled over 200,000 miles. It was an achievement for those times. His 200,000 mile travel was an achievement at that time. He journeyed over 200,000 miles. This is a great feat before the invention of flight. He traveled over 200,000 miles. This was an incredible achievement in the times before aircraft. He traveled over 200,000 miles, which was a great achievement before people could fly. He traveled over 200,000 miles. It was an incredible achievement for a time before planes. He traveled over 200,000 miles which was very far for pre-airplane times. He traveled over 200,000 miles. This was a great achievement for times before aviation. He traveled over 200,000 miles which was an incredible achievement for pre-aviation times. He traveled more than 200,000 miles, an incredible achievement in the pre-aeronautical era.