Complex sentence: While the wreckage of an AT-9A recovered from a crash site in 2003 was turned over to the Pima Air & Space Museum for restoration, the aircraft is incomplete and will require a long and extensive restoration for display.
Split into simpler sentences: While the wreckage of an AT-9A recovered from a crash site in 2003 was turned over to the Pima Air & Space Museum for restoration. The aircraft is incomplete and will require a long and extensive restoration for display.