Complex sentence: A pair of Martin 4-0-4s which had not flown since 1967 were re-certified for flight, and on October 2,1970, these were ferried from the Jack Richards Aircraft Company facilities in Oklahoma City to Wichita, instead of a DC-6.
Split into simpler sentences: A pair of Martin 4-0-4s, which had not flown since 1967, were re-certified for flight. On October 2,1970, these were ferried from the Jack Richards Aircraft Company facilities in Oklahoma City to Wichita, instead of the DC-6.