Complex sentence: Rich International Airways was founded as a cargo airline in 1969, flying Curtis C-46 Commando and Beech 18 "Twin Beech" aircraft to the Caribbean.
Split into simpler sentences: Rich International Airways was founded as a cargo company in 1969. In the beginning, Rich International used Curtis C-46 Commando and Beech 18 "Twin Beech" for freight flights to the Caribbean.