Complex sentence: The aircraft, a Yakovlev Yak-42D, construction number 4520424305017, was first flown in 1993; and after operations with several airlines joined the Yak-Service fleet, which was the operator of the aircraft when it crashed.
Split into simpler sentences: The aircraft, a Yakovlev Yak-42D, construction number 4520424305017, was first flown in 1993. After operations with several airlines, it joined the Yak-Service fleet, which was the operator of the aircraft when it crashed.