What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) On December 12, 2006, at approximately 2000 MST, a take-off roll was initiated on runway 13 at gnt in N66X, a Beechcraft model 55 baron, serial number TC-773. At about 900 feet down the runway, the aircraft veered to the left and ran off the runway, the right main landing gear (MLG) collapsed shortly after leaving the runway, then the right propeller and right wing contacted the ground causing the aircraft to spin to the right and came to rest pointing to the right with all three gear collapsed and the nose gear separated at the wheel 1/2 fork. The intended flight was a 14 CFR part 91 instructional flight. The two occupants on board were both pilots, however the left seat pilot was not rated for the aircraft and instruction was being given by the right seat pilot, acting as pilot in command.
As the FAA filed it
(-23) ON DECEMBER 12, 2006, AT APPROXIMATELY 2000 MST, A TAKE-OFF ROLL WAS INITIATED ON RUNWAY 13 AT GNT IN N66X, A BEECHCRAFT MODEL 55 BARON, SERIAL NUMBER TC-773. AT ABOUT 900 FEET DOWN THE RUNWAY, THE AIRCRAFT VEERED TO THE LEFT AND RAN OFF THE RUNWAY, THE RIGHT MAIN LANDING GEAR (MLG) COLLAPSED SHORTLY AFTER LEAVING THE RUNWAY, THEN THE RIGHT PROPELLER AND RIGHT WING CONTACTED THE GROUND CAUSING THE AIRCRAFT TO SPIN TO THE RIGHT AND CAME TO REST POINTING TO THE RIGHT WITH ALL THREE GEAR COLLAPSED AND THE NOSE GEAR SEPARATED AT THE WHEEL 1/2 FORK. THE INTENDED FLIGHT WAS A 14 CFR PART 91 INSTRUCTIONAL FLIGHT. THE TWO OCCUPANTS ON BOARD WERE BOTH PILOTS, HOWEVER THE LEFT SEAT PILOT WAS NOT RATED FOR THE AIRCRAFT AND INSTRUCTION WAS BEING GIVEN BY THE RIGHT SEAT PILOT, ACTING AS PILOT IN COMMAND.