Complex sentence: The 309 was originally intended to be badged as a Talbot and, as development progressed, to be called the Talbot Arizona; it was the replacement for the Simca-based Horizon.
Split into simpler sentences: The 309 was originally intended to be badged as a Talbot and, as development progressed, to be called the Talbot Arizona. It was the replacement for the Simca-based Horizon.