Complex sentence: Original models from model years 1977 to 1980 derived from the Datsun Bluebird (810) and available as a sedan and station wagon initially, with a coupe introduced later on.
Split into simpler sentences: Original models from model years 1977 to 1980 derived from the Datsun Bluebird (810). First generation 810s were available as a sedan and station wagon initially, with a coupe introduced later on.