Complex sentence: While not much changed for the everyday buyer, for the performance oriented, things were a little different; for partway through this year and in limited quantities there became available Ford's new racing secret weapon, the 427, replacing the 406.
Split into simpler sentences: While not much changed for the everyday buyer, for the performance oriented things were a little different. Partway through this year and in limited quantities there became available Ford's new racing secret weapon, the 427, replacing the 406.