Complex sentence: Chesapeake, Boston, and New York--have attracted between 5,000 and 7,000 fans to each game in recent years, while low attendance teams struggle to get 2,000 people in the seats.
Split into simpler sentences: Chesapeake, Boston, and New York--have attracted between 5,000 and 7,000 fans each game in recent years. Low attendance teams struggle to get 2,000 people in the seats.