Complex sentence: In southern Maine, frustration with bus service drove the state to explore restarting passenger service, resulting in contracting with Amtrak to operate the "Downeaster", which runs from North Station to Haverhill and up to Portland.
Split into simpler sentences: In southern Maine, frustration with bus service drove the state to explore restarting passenger service, resulting in contracting with Amtrak to operate "Downeaster". The "Downeaster" runs from North Station to Haverhill and up to Portland.