Complex sentence: The book is set in the Tenley Heights section of Baltimore, Maryland, about which little is known except for the fact that Memorial Stadium, then-home of the Baltimore Orioles, is in the neighborhood.
Split into simpler sentences: The book is set in the Tenley Heights section of Baltimore, Maryland. Little is known about this town except for the fact that Memorial Stadium, then-home of the Baltimore Orioles, is in the neighborhood.