What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) During approach the landing gear handle was placed in the down position. The nose and left main gear indicated down and locked with a corresponding unsafe condition on the right main gear. After three low approaches and an attempt to manually extend the landing gear, the tower reported the gear "appears" to be down. During the landing ground roll between 80-90 knots the right main gear collapsed as reported by the mishap pilot. After inspection of the aircraft landing gear, the right main gear torque tube assembly was found to have broken around the circumference of the torque tube aft of the flang welded bead.
As the FAA filed it
(-23) DURING APPROACH THE LANDING GEAR HANDLE WAS PLACED IN THE DOWN POSITION. THE NOSE AND LEFT MAIN GEAR INDICATED DOWN AND LOCKED WITH A CORRESPONDING UNSAFE CONDITION ON THE RIGHT MAIN GEAR. AFTER THREE LOW APPROACHES AND AN ATTEMPT TO MANUALLY EXTEND THE LANDING GEAR, THE TOWER REPORTED THE GEAR "APPEARS" TO BE DOWN. DURING THE LANDING GROUND ROLL BETWEEN 80-90 KNOTS THE RIGHT MAIN GEAR COLLAPSED AS REPORTED BY THE MISHAP PILOT. AFTER INSPECTION OF THE AIRCRAFT LANDING GEAR, THE RIGHT MAIN GEAR TORQUE TUBE ASSEMBLY WAS FOUND TO HAVE BROKEN AROUND THE CIRCUMFERENCE OF THE TORQUE TUBE AFT OF THE FLANG WELDED BEAD.