Complex sentence: American Family Publishers, was an American company that sold magazine subscriptions, best known for running sweepstakes in which a large amount of money was offered as the grand prize (in a range of several hundred thousand to one or more million dollars).
Split into simpler sentences: American Family Publishers, was an American company that sold magazine subscriptions. It is best known for running sweepstakes in which a large amount of money was offered as the grand prize (in a range of several hundred thousand to one or more million dollars).