Complex sentence: With the help of Aeritalia development began of a nine-seat turboprop version, the first aircraft (an AP.68TP) first flew in 1978 using Allison 250 turboprops.
Split into simpler sentences: With the help of Aeritalia, development began of a nine-seat turboprop version. The first aircraft, an AP.68TP, first flew in 1978 using Allison 250 turboprops.