What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
CFI pilot was flying phase one flight testing with the intention of privacy data omitted / builder transition training at later date. Pilot conducted flight maneuvers intending both paved runway and grass runway landings. On rollout the landing of the first grass touchdown the aircraft sank in the muddy soft field, collapsing the nose gear strut with one blade propeller strike and breaking aft. No other damage to aircraft.
As the FAA filed it
CFI PILOT WAS FLYING PHASE ONE FLIGHT TESTING WITH THE INTENTION OF ^PRIVACY DATA OMITTED^ / BUILDER TRANSITION TRAINING AT LATER DATE. PILOT CONDUCTED FLIGHT MANEUVERS INTENDING BOTH PAVED RUNWAY AND GRASS RUNWAY LANDINGS. ON ROLLOUT THE LANDING OF THE FIRST GRASS TOUCHDOWN THE AIRCRAFT SANK IN THE MUDDY SOFT FIELD, COLLAPSING THE NOSE GEAR STRUT WITH ONE BLADE PROPELLER STRIKE AND BREAKING AFT. NO OTHER DAMAGE TO AIRCRAFT.