Complex sentence: The MBTA Commuter Rail is the commuter rail system for the Greater Boston metropolitan area of Massachusetts and is owned by the Massachusetts Bay Transportation Authority (MBTA) and operated under contract by the Massachusetts Bay Commuter Railroad Company (MBCR).
Split into simpler sentences: The MBTA Commuter Rail is the commuter rail system for the Greater Boston metropolitan area of Massachusetts. It is owned by the Massachusetts Bay Transportation Authority (MBTA) and operated under contract by the Massachusetts Bay Commuter Railroad Company (MBCR).