Complex sentence: The law authorized truckers to price freely within a "zone of reasonableness," meaning that truckers could increase or decrease rates from current levels by 15 percent without challenge, and encouraged them to make independent rate filings with even larger price changes.
Split into simpler sentences: The law authorized truckers to price freely within a "zone of reasonableness" and so truckers could increase or decrease rates from current levels by 15 percent without challenge. They were encouraged to make independent rate filings with even larger price changes.