What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Flight instructor was providing multi engine training to an ATP applicant. (Holder of commercial pilot certificate with airplane multi engine land ratings.) After airwork practice, they returned to Scottsdale airport to practice landings. After a couple of landings, they began practicing single engine landings. Both pilots state that they did not hear the gear warning horn, and had failed to extend the gear. Neither pilot performed a before landing checklist. The flight instructor states that he didn't realize anything was wrong until he realized they were flaring too long, and it was too late to do anything about it. The PIC (flight instructor) states that the pattern was not busy and that he was "done" instructing. It was very quiet in the cockpit until the scraping of the belly of the aircraft.
As the FAA filed it
FLIGHT INSTRUCTOR WAS PROVIDING MULTI ENGINE TRAINING TO AN ATP APPLICANT. (HOLDER OF COMMERCIAL PILOT CERTIFICATE WITH AIRPLANE MULTI ENGINE LAND RATINGS.) AFTER AIRWORK PRACTICE, THEY RETURNED TO SCOTTSDALE AIRPORT TO PRACTICE LANDINGS. AFTER A COUPLE OF LANDINGS, THEY BEGAN PRACTICING SINGLE ENGINE LANDINGS. BOTH PILOTS STATE THAT THEY DID NOT HEAR THE GEAR WARNING HORN, AND HAD FAILED TO EXTEND THE GEAR. NEITHER PILOT PERFORMED A BEFORE LANDING CHECKLIST. THE FLIGHT INSTRUCTOR STATES THAT HE DIDN'T REALIZE ANYTHING WAS WRONG UNTIL HE REALIZED THEY WERE FLARING TOO LONG, AND IT WAS TOO LATE TO DO ANYTHING ABOUT IT. THE PIC (FLIGHT INSTRUCTOR) STATES THAT THE PATTERN WAS NOT BUSY AND THAT HE WAS "DONE" INSTRUCTING. IT WAS VERY QUIET IN THE COCKPIT UNTIL THE SCRAPING OF THE BELLY OF THE AIRCRAFT.