Complex sentence: The top-line model was the Sigma SE and was initially only available with the'Astron 2000' and 3-speed automatic, it had equipment levels never heard of at the time including reclining rear seats.
Split into simpler sentences: The top-line model was the Sigma SE and was initially only available with the'Astron 2000' and 3-speed automatic. It had equipment levels never heard of at the time including reclining rear seats.