Complex sentence: The Expos'attendance flatlined after the fire sale, dropping 26 percent from 1994 and remaining below an average of 20,000 per game during the team's last 10 seasons in Montreal.
Split into simpler sentences: The Expos' attendance flatlined after the fire sale, dropping 26 percent from 1994. Their average attendance would never top more than 20,000 per game during their last 10 seasons in Montreal.