Complex sentence: Line B of Porto Metro links Póvoa de Varzim to Porto and the airport with two services: a standard and a shuttle (the "Expresso"); through Verdes station, Metro trains link the city and the airport.
Split into simpler sentences: Line B of Porto Metro links Póvoa de Varzim to Porto and the airport with two services: a standard and a shuttle (the "Expresso"). Through Verdes station, Metro trains link the city and the airport.