Complex sentence: The second aircraft was Learjet 35A, registered D-CGFI, msn 35A-612, first flown in 1985 and operated by GFD Gesellschaft Fur Flugzieldarstellung, a subsidiary company of Airbus Defence and Space.
Split into simpler sentences: The second aircraft was a Learjet 35A, registered D-CGFI, msn 35A-612. It was operated by the GFD Gesellschaft Fur Flugzieldarstellung, a subsidiary company of Airbus Defence and Space.