Complex sentence: The chain was unusual in that it was a nonprofit consumers' cooperative; it had been founded by 800 U.S. Post Office workers who wanted to leverage their buying power by purchasing goods directly from wholesalers.
Split into simpler sentences: The chain was unusual in that it was a nonprofit consumers' cooperative. It was founded by 800 U.S. Post Office workers who wanted to leverage their buying power by purchasing goods directly from wholesalers.