Complex sentence: In September 2010, the MBTA completed a feasibility study of extending commuter rail to Foxboro via the Franklin Line, currently served only during special events at Gillette Stadium.
Split into simpler sentences: In September 2010, the MBTA completed a study to determine the feasibility of extending regular commuter rail service to Foxboro via the Franklin Line. Currently, the station is only served during special events at Gillette Stadium.