What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Aircraft lost electrical power due to a broken alternator field wire. PIC extended the landing gear using the emergency extension system. At this time there was insufficient battery power remaining to illuminate the landing gear position lights. On landing roll-out, the landing gear collapsed. Inspection of the aircraft found no discrepancy with the emergency extension system.
As the FAA filed it
AIRCRAFT LOST ELECTRICAL POWER DUE TO A BROKEN ALTERNATOR FIELD WIRE. PIC EXTENDED THE LANDING GEAR USING THE EMERGENCY EXTENSION SYSTEM. AT THIS TIME THERE WAS INSUFFICIENT BATTERY POWER REMAINING TO ILLUMINATE THE LANDING GEAR POSITION LIGHTS. ON LANDING ROLL-OUT, THE LANDING GEAR COLLAPSED. INSPECTION OF THE AIRCRAFT FOUND NO DISCREPANCY WITH THE EMERGENCY EXTENSION SYSTEM.