Complex sentence: The Audi TT has been produced in two generations, each available in two car body styles; as a 2 +2 Coupé, or two-seater Roadster.
Split into simpler sentences: The Audi TT has been produced in two generations. Both generations have been available in two car body styles; as a 2 +2 Coupé, or two-seater Roadster.